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    Wyświetlanie 1-27 z 27
    Tytuł:
    Synthesis and Characterization of Cu(II), Ni(II) and Co(II) Based Schiff Base Complexes
    Autorzy:
    Bhalu, A.
    Vilapara, K.
    Maru, M.
    Shah, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412444.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    schiff base
    metal complexes
    Opis:
    N-(3-Bromo-4-hydroxy-5-methoxybenzylidene)-4-Bromobenzenamine was synthesized. This was further used to synthesize Co(II), Ni(II) and Co(II) based metal complexes and characterized by FT-IR, Elemental analysis, ESI Mass and UV spectroscopy.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 12; 51-55
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SELENO-L-METHIONINE MODULATE THE TOXIC EFFECT OF NEW DOXORUBICIN METAL COMPLEXES IN PROKARYOTIC MODEL –ESCHERICHIA COLI RFM443 RECA::LUX
    Autorzy:
    Matejczyk, Marzena
    Świderski, Grzegorz
    Lewandowski, Włodzimierz
    Powiązania:
    https://bibliotekanauki.pl/articles/895497.pdf
    Data publikacji:
    2019-02-28
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    cancer
    selenium
    metal complexes
    Dox
    toxicity
    Opis:
    Abstract: The main problem of modern cancer therapy is their resistance to the drugs used and the toxicity of drugs to healthy cells of the human body. Hope is natural substances that are protective of cells and often support the action of standard anticancer chemotherapy. Among them are selenium compounds. In the present study, we examined the cytotoxic and genotoxic potency of doxorubicin (DOX) metal complexes as new anticancer drug candidates. We also measured the effect of simultaneous administration of seleno –L-methionine as biologically active agent with DOX and its complexes with Mn, Mg, Fe, Co and Ni in prokaryotic model - Escherichia coli RFM443 with plasmid transcriptional fusion of recA promoter and luxCDABE as a reporter gene. The results obtained by us, indicate high biological activity of metal complexes with doxorubicin. The strongest modulatory effect was observed using the DOX complexes with Co and Ni compared to the DOX. The DOX complexes with Mg, Mn and Fe also showed relatively high biological activity. Simultaneous bacteria culture treatment with SeMet decreased the values of the DOX and its metal complexes cyto- and genotoxic parameters. These results encourage further research to assess the value of the doxorubicin metal complexes as new cytostatic drug candidates. While SeMet may be considered as therapeutic option in cancer treatment as modulation agent in anti-cancer therapy.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 115-125
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, physicochemical studies, fluorescence behavior, and anticancer properties of transition metal complexes with the pyridyl ligand
    Autorzy:
    Azam, Mohammad
    Al-Resayes, Saud I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174812.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Pyridyl ligand
    metal complexes
    anticancer activity
    Opis:
    A novel series of complexes with the formula [MLCl] [M = Co(II) (1), Ni(II) (2), Cu(II) (3), Zn(II) (4)] arising from Pyridyl ligand, N,N’-bis(1-(2-pyridyl)ethylidene)-2,2-dimethylpropane-1,3-diamine), ligand, L, was synthesized and investigated by elemental analyses, FT-IR, 1H and 13C NMR, Powder XRD, and thermal analyses. TGA analysis indicated that all complexes degraded in three different steps, while the PXRD examination showed well-defined sharp crystalline peaks for the complexes, indicating significant crystallinity. The antiproliferative activity of the ligand and its complexes were also evaluated in vitro against the HeLa (Human Cervical Cancer Cells) and HCT116 (Colon Cancer Cells) cell lines. The findings suggested complex 4 to be potential anticancer agent against these cell lines. In addition, ligand and its complexes also exhibited considerable emission properties.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 3; 35--40
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrafiltration membranes from polysulfone and sulfonated polysulfone in metal ions dialysis enhanced by polyelectrolyte
    Autorzy:
    Poźniak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/346903.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    polysulfone
    ultrafiltration membrane
    metal dialysis
    polymer-metal complexes
    Opis:
    The dialysis of metal ions including Mg(II), Ni(II) and Zn(II) through ultrafiltration membranes made of polysulfone and sulfonated polysulfone was enhanced by sodium salt of poly(acrylic acid) diluted in the receiving compartment. In experiments, concentration of Mg(II), Ni(II) and Zn(II) in the feed solution was equal to 10-3 mol/dm3, concentration of polymer in the receiving solution was equal to 10-2 mol/dm3, and pH = 9. In the presence of complexing polymer, concentration of all metal ions in the receiving solution is higher than 50% for the polysulfone membrane and increases to almost 100% for the sulfonated polysulfone membrane. This effect is due to a cation-exchange property of the sulfonated polysulfone membrane.
    Źródło:
    Ars Separatoria Acta; 2006, 4; 50-56
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chelating ability of proctolin tetrazole analogue
    Autorzy:
    Łodyga-Chruścińska, Elżbieta
    Sanna, Daniele
    Micera, Giovanni
    Chruściński, Longin
    Olejnik, Jadwiga
    Nachman, Ronald
    Zabrocki, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1041268.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    metallopeptides
    metal complexes
    proctolin
    tetrazole peptide analogue
    Opis:
    The aim of the investigation was to establish the chelating ability of a new proctolin analogue of the sequence Arg-Tyr-LeuΨ[CN4]Ala-Thr towards copper(II) ions. The insertion of the tetrazole moiety into the peptide sequence has considerably changed the coordination ability of the ligand. Potentiometric and spectroscopic (UV-Vis, CD, EPR) results indicate that the incorporation of 1,5-disubstituted tetrazole ring favours the formation of a stable complex form of CuH-1L. This 4N coordination type complex is the dominant species in the physiological pH range. The tetrazole moiety provides one of these nitrogens. The data indicate that Cu(II) ions are strongly trapped inside the peptide backbone. These findings suggest that Cu(II) can hold peptide chains in a bent conformation. This bent conformation may be essential for bioactivity of the tetrazole peptides.
    Źródło:
    Acta Biochimica Polonica; 2006, 53, 1; 65-72
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of transition metal complexes of some novel pyrazolo-chalcone derivatives
    Autorzy:
    Odedra, Pratap
    Rojivadiya, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1066234.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Pyrazolochalcone derivatives
    Thermal gravimetric analysis
    Transition metal complexes
    Opis:
    Some novel pyrazolo-chalcone molecules were synthesized by condensation of pyrzolo aldehyde with appropriate acetophenone. The synthesis of some metal complexes of transition metal was carried out with these pyrazoleo heterocyclic compounds. Each metal complex was synthesized by the reaction of new pyrazolochalcone derivatives with the metal salts such as Co(CH3COO)2·6H2O, Ni(CH3COO)2·6H2O, and Cu(CH3COO)2·2H2O. For the structure elucidation of ligand molecule various spectroscopic techniques such as 1H NMR, IR and mass has been used. The synthesized metal complexes were subjected to thermal study i.e., TGA and DTA in order to check structural conformation of synthesized metal complexes.
    Źródło:
    World Scientific News; 2019, 131; 242-255
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Safety Properties of New Explosive Coordination Compounds
    Autorzy:
    Wojewódka, A.
    Bełzowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358028.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    transition metal complexes
    5-picrylaminotetrazole
    explosives
    safety properties
    Opis:
    The present paper details the synthesis of new explosive complexes of the DDT type and the investigation of their sensitiveness to friction and impact. Fourteen new compounds, specifically nitrate and perchlorate complexes of various transition block metals with 5-(2,4,6-trinitrophenylamino)tetrazole, commonly called picrylaminotetrazole (PAT), were synthesised. The nitrate complexes were obtained in yields varying between 8.1% and 75.1%, whereas the perchlorate complexes had yields between 24.9% and 67.3%, with yields typically near the upper bound of the given ranges for both classes of complexes and the low yields obtained for [Co(PAT)3](NO3)3 and [Cd(PAT)3](ClO4)3 being the exception rather than the rule. The structures of these compounds were unambiguously established via XRF and IR spectroscopy, as well as via elemental analysis. Detailed analyses of the safety properties of these new materials were performed in terms of their sensitiveness to friction and impact. In general, the obtained compounds present relatively low sensitivity to mechanical stimuli, like friction and impact, with the nitrate complexes of Ni and Zn exhibiting high sensitivity to impact (1-2 Nm). The rest of the investigated compounds show low sensitivity to mechanical stimuli, comparable to classical blasting materials like PETN, RDX or HMX. It should be noted that, in general, the nitrates were more sensitive to mechanical stimuli than their perchlorate analogues.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 2; 351-360
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the mathematical models of distillation equilibria for designing the differential distillation process
    Autorzy:
    Sobczak, E.
    Ringel, T.
    Łataś, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/346973.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    colorants
    asymmetric metal complexes
    heteroleptic complexes
    resistance to UV radiation
    acetylacetone
    Opis:
    This paper presents the development of mathematical models for positive and negative azeotropes in the range of the more volatile concentrations component: x∈[0; az] ∨ [az; 1]. The coefficients of these models, which, on their basis, were determined the relative volatility of α and the azeotrope concentration az, defined with the high accuracy (R2∈[0,926; 0,999]) and presented them to the table for all subjects of distillation systems. Based on these relationships, the integration of the mass balance equations of the distillation differential process d(Sx)=ydS was carried out and determined the dependence of the distillate obtained from 1 mole of pig iron D/S0 from the α, az coefficients and xw, xs concentrations. Based on these dependencies, charts D/S0 were prepared from predefined by the authors parameter t=[0,05; 0,25; 0,5; 0,75] which is the change in the concentration of pig iron in the process of concentration. Dependencies, presented for distillation balances of positive and negative azeotrope, in the tested ranges, for similar values of α, have the same mileage. The calculations were made for the 126 distillation systems.
    Źródło:
    Ars Separatoria Acta; 2012-2013, 9/10; 103-116
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New colorant metal complexes, derivatives of 1,2–diazoxy–4–naphthalenesulfonic acid and pentane-2,4-dione. Part I. Preparation and properties
    Autorzy:
    Wasilewska, A.
    Maćkowska, E.
    Urbaniak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/347021.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    colorants
    asymmetric metal complexes
    heteroleptic complexes
    resistance to UV radiation
    acetylacetone
    Opis:
    A vast array of colorants used in various industries include metal complex colorants, which are useful mainly in the textile industry. Substances to be used in fiber dyeing are expected to have optimum properties, therefore, such compounds remain to be of interest to researchers. The results of studies on the possible modifications of known colorants are presented in this paper.
    Źródło:
    Ars Separatoria Acta; 2012-2013, 9/10; 95-102
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, spectral characterization and biological activity studies of Schiff’s base of 1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-4-amine and its metal complexes
    Autorzy:
    Jadeja, Juvansinh J.
    Gondaliya, Mitesh B.
    Mokariya, Devang M.
    Shah, Manish
    Powiązania:
    https://bibliotekanauki.pl/articles/1192661.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Schiff Bases
    anti-microbial activity
    Metal complexes
    spectral analysis
    Opis:
    N,O,O-donating tridentate ligand was prepared by condensed reaction 1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-4-amine with derivative of salicylaldehyde and its metal complexes with Zn, Cd and Hg, which is highly stable at room temperature and characterized by Mass spectra, IR, 1H and 13C NMR, ESI-MASS and TGA-DTA. Comparatively studies of anti-microbial and anti-fungal activity of different ligand and its metal complex carried out.
    Źródło:
    World Scientific News; 2016, 47, 2; 123-150
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ionic liquid assisted olefin reactions
    Autorzy:
    Thirunarayanan, G.
    Muthuvel, I.
    Sathiyendiran, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075429.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ionic liquids
    Metal complexes
    Nano catalysts
    alkene reactions
    olefin reactions
    Opis:
    In this review article the authors studied the ionic liquid assisted various alkene reactions with various metal complex catalysts such as Isomerization, Hydrogenation, Hydroformylation, Metathesis-Oligomerization, Dimerization, Arylation, Cyclization, Polymerization, Epoxidation, Michael addition and Tandem Cross-coupling reactions.
    Źródło:
    World Scientific News; 2019, 126; 36-64
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, computational, anticancerous and antiproliferative effects of some copper, manganese and zinc complexes with ligands derived from symmetrical 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde
    Autorzy:
    Ababneh, Taher S.
    El-Khateeb, Mohammad
    Tanash, Aissar K.
    AL-Shboul, Tareq M.A.
    Shammout, Mohammad Jamal A.
    Jazzazi, Taghreed M.A.
    Alomari, Mohammad
    Daoud, Safa
    Talib, Wamidh H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849324.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    tetradentate schiff base
    symmetrical metal complexes
    DFT calculation
    spectroscopy
    anticancerous
    antiproliferative
    Opis:
    Four new symmetrical Schiff bases derived from 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde have been synthesized and characterized by elemental analysis and different spectroscopic techniques. The reaction of 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl with two equivalents of 5-tert-butyl-, 3,5-dinitro-, 3,5-dibromo- and 3-tert-butyl-salicylaldehyde yielded 2,2’-bis(5-tert-butyl-salicylideneamino)-4,4’-dimethyl-1,1’-biphenyl (A1) as well as the 3,5-dinitro- (A2), 3,5-dibromo- (A3) and 3-tert-butyl- (A4) substituted derivatives. The tetradentate ligands were then reacted with copper-, manganese- and zinc-acetate producing the tetra-coordinate metal complexes which were characterized by FTIR, UV-Visible spectroscopy, magnetic susceptibility and elemental analysis. Zinc complexes were characterized by 1H-NMR spectroscopy. Density functional theory (DFT) calculations at the B3LYP/6-31G(d) level of theory were carried out to fully optimize and examine the molecular geometries of complexes. Subsequently, IR vibrational and UV-Vis absorption spectra were computed and correlated with the observed values and the results are in good agreement with the experimental data. The anticancerous and antiproliferative activity of the A3 ligand and its metal complexes were determined.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 1; 7-15
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Formation of Polycomplexes of Poly(Methyl Vinyl Ether-Co-Maleic Anhydride) and Bovine Serum Albumin in the Presence of Copper Ions
    Autorzy:
    Karahan, M
    Mustafaeva, Z
    Özeroğlu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/778272.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    bovine serum albumin
    copper ions
    metal complexes
    biological processes
    biomaterials
    polyelectrolyte
    Opis:
    The binary and ternary complex formations of poly(methyl vinyl ether-co-maleic anhydride) (PMVEMA) with copper ions and with bovine serum albumin (BSA) in the presence of copper ions in phosphate buffer solution at pH = 7 were examined by the techniques of UV-visible, fluorescence, dynamic light scattering, atomic force microscopy measurements. In the formation of binary complexes of PMVEMA-Cu(II), the addition of copper ions to the solution of PMVEMA in phosphate buffer solution at pH = 7 forms homogeneous solutions when the molar ratio of Cu(II)/MVEMA is 0.5. Then the formations of ternary complexes of PMVEMA-Cu(II)-BSA were examined. Study analysis revealed that the toxicities of polymer-metal and polymer-metal-protein mixture solutions depend on the nature and ratio of components in mixtures.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 3; 97-105
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zasady Schiffa – interesujący zakres zastosowań w różnych dziedzinach nauki
    Schiff bases – interesting range of applications in various fields of science
    Autorzy:
    Brodowska, K.
    Łodyga-Chruścińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/142348.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    zasady Schiffa
    kompleksy metali
    chemia koordynacyjna
    Schiff bases
    metal complexes
    coordination chemistry
    Opis:
    Kompleksy metali odgrywają istotną rolę zarówno w rolnictwie, jak również chemii farmaceutycznej i przemysłowej. Zasady Schiffa są produktami kondensacji pierwszorzędowych amin i związków karbonylowych. Związki te oraz ich kompleksy z metalami są coraz częściej stosowane jako katalizatory, polimery i barwniki. W artykule przedstawiono właściwości zasad Schiffa oraz korzyści wynikające z ich stosowania w różnych gałęziach przemysłu.
    Metal complexes play an important role in agriculture as well as industrial and pharmaceutical chemistry. Schiff bases are the condensation products of primary amines and carbonyl compounds. Schiff bases and their metal complexes are increasingly being used as catalysts, polymers and dyes. This paper reviews the properties of Schiff bases and benefits of their use in various branches of industry.
    Źródło:
    Chemik; 2014, 68, 2; 129-134
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibacterial Activities of Some Transition Metal Schiff Base Complexes
    Autorzy:
    Islam, M.N.
    Shahriar, S.M.S.
    Islam, M.K.
    Jesmin, M.
    Ali, M.M.
    Khanam, J.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411780.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    antibacterial activity
    Schiff base transition metal complexes
    minimum inhibitory concentration
    Brine shrimp lethality
    Opis:
    A new series of four transition metal complexes of a Schiff base derived from salicylaldehyde and glycine, viz. [N-salicylidene glycinato diaqua cobalt (II) dimer] (SGCo)2, [N- salicylideneglycinato-di-aqua-nickel(ll)dimer] (SGN)2, [N-salicylideneglycinato-aqua-copper(II)] (SGC) and [N-salicylidene glycinato diaqua zinc(II) dimer] (SGZ)2 have been synthesized and characterized through a rapid, simple, and efficient methodology in excellent yield. These compounds were screened for in vitro antibacterial activities against six pathogenic bacteria, such as Shigella sonnei, Escherichia coli, Bacilus subtilis, Sarcina lutea, Staphylococcus aureus and Pseudomonas arioginosa. The antibacterial activity was determined by the disc diffusion method using DMSO as solvent. The results indicate that (SGC) compound exhibit a significant antibacterial activity, depending on the bacterial strain and (SGCo)2, (SGN)2 and (SGZ)2 compounds show a moderate sensitivity even with higher doses. All these compounds were found to possess cytotoxic effect.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 5; 12-20
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peptydy jako potencjalne ligandy wiążące jony metali przejściowych
    Peptides as potential ligands binding transition metal ions
    Autorzy:
    Krupa, K.
    Lesiów, M. K.
    Kowalik-Jankowska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/171519.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    peptydy
    reszta histydylowa
    kompleksy metali
    model koordynacyjny
    peptides
    histidine residue
    metal complexes
    coordination mode
    Opis:
    Peptides are crucial ligands for transition metal ions and form complexes with them, that can have important biological activity. Many factors impact on the creation of complexes such as: protection of amine group from N-terminal or carboxylate group from C-terminals of the protein, the presence of noncoordinating and coordinating side chains in the peptide sequence, the number of histidyl residues and their location in the peptide chain. In complexes the metal ion can be bound bound by various donor atoms from amino acids residues (e.g. nitrogen, oxygen or sulphur). In general, the protection of N- or C-terminal groups influences the less stable formation of complexes. Stable complexes are created, if the free amine group from the N-terminal is involved in the coordination process. Peptides with noncoordinating side chains include alanine or glycine. Glycine complexes are more stable than these with alanine. Histidyl residue is the most effective amino acid residue in binding metal ions. The amine group of the lysyl residue, thiol from cysteine or carboxylate from aspartyl or glutamyl residues are also functional groups that coordinate metal ions. The coordination process is initiated by a group that anchors metal ion. A free amine group from N-terminus or imidazole nitrogen are the best examples of anchor groups. The metal ions can also be bound through amide nitrogens, after their forced deprotonation by the anchor group and formation of chelate rings. Peptides containing two or more histidyl residues exhibit high structural diversity in the complexes formation. In addition, these peptides can also form macrochelates and polynuclear complexes. The location of amino acid residues in the peptide chain (especially histydyl residue) also results in the thermodynamically stable formation of complexes.
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 7-8; 597-608
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka procesu aktywacji cząsteczki tlenu molekularnego na solwatowanych wybranych metalach przejściowych (3d) — obliczenia DFT
    Characteristics of the oxygen molecule activation process on 3d selected transition metals — DFT calculations
    Autorzy:
    Anioł, Aleksandra
    Niemiec, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/29521103.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Tarnowska
    Tematy:
    aktywacja tlenu molekularnego
    DFT
    solwatowane kompleksy metali przejściowych
    activation of molecular oxygen
    solvated metal complexes transitional
    Opis:
    Przedmiotem pracy jest charakterystyka procesu aktywacji cząsteczki tlenu molekularnego na solwatowanych wybranych metalach przejściowych (3d). W niniejszej pracy, korzystając metody DFT (ang. density functional theory), wykonano obliczenia kwantowo-mechaniczne, których celem było scharakteryzowanie struktury elektronowej sześciokoordynacyjnych kompleksów wodnych i acetonitrylowych o wzorach ogólnych [TM(H₂O)₆]n+ i [TM(CH₃CN)₆]n+, gdzie: n = 2, 3 oraz kompleksów z zaadsorbowaną na centrum metalicznym cząsteczką tlenu molekularnego: ([TM(H₂O)₅–O₂]n+ i [TM(CH₃CN)₅–O₂]n+), gdzie n = 2, 3. Do obliczeń wybrano jony metali przejściowych TM (ang. transition metal) z okresu czwartego: Co2+, Fe2+, Mn2+, Ni2+, Zn2+, Cu2+ oraz Cr3+. Na podstawie przeprowadzonych obliczeń stwierdzono, że każdy z analizowanych w pracy parametrów jest funkcją wprowadzonego metalu przejściowego. Co więcej efekt użytego metalu przejściowego na analizowane parametry (np. energetyka orbitali granicznych, rozmiar przerwy energetycznej, ładunki, itd.) przewyższa efekt użytego rozpuszczalnika (H₂O/CH₃CN).
    The subject of this research is the characterization of the activation process of the oxygen molecule on solvated selected transition metals (3d). In this study , using the Density Functional Theory, quantum-mechanical calculations were made, the purpose of which was to characterize the electronic structure of water and acetonitrile six-coordinated complexes with general formulas [TM(H₂O)₆]n+ and [TM(CH₃CN)₆]n+, where: n = 2, 3, and complexes with adsorbed at the metal center with an oxygen molecule ([TM(H₂O)₅–O₂]n+ i [TM(CH₃CN)₅–O₂]n+), where: n = 2, 3. The calculations were made using transition metal ions from the fourth period of periodic table: TM = Co2+, Fe2+, Mn2+, Ni2+, Zn2+, Cu2+ and Cr3+. Based on the calculations performed, it was found that each of the parameters analyzed in this work is a function of the introduced transition metal. Moreover, the effect of the transition metal used on the analyzed parameters (e.g. energetics of boundary orbitals, size of the energy gap, charges, etc.) exceeds the effect of the solvent used (H₂O/CH₃CN).
    Źródło:
    Science, Technology and Innovation; 2023, 17, 1-2; 30-40
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel silver complexes with popular non-steroidal anti-inflammatory drugs
    Autorzy:
    Kafarska, K.
    Wolf, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/105628.pdf
    Data publikacji:
    2016
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    non-steroidal anti-inflammatory drugs
    metal complexes
    FTIR
    thermal investigations
    niesteroidowe leki przeciwzapalne
    kompleksy metali
    badania cieplne
    Opis:
    Non-steroidal anti-inflammatory drugs (NSAID) are class of drugs with antipyretic, analgesic and anti-inflammatory properties. They have also exhibited anti-tumor activity. Even though the mode of their anti-inflammatory activity action is well understood, they exhibit significant adverse effects. Metal complexesation with NSAID may be a promising option for side effects reduction. The novel silver complexes with commonly used non-steroidal anti-inflammatory drugs: ibuprofen, naproxen, mefenamic acid and ketoprofen, were synthesized and characterized by elemental analysis, IR- spectroscopy and thermal decomposition techniques. Coordination of ligands to the silver ions was confirmed by IR spectroscopy. IR data clearly indicate that NSAID anions are bonded in a monodentate mode. The thermal behavior of complexes was studied by TG, DTG and DTA methods in air. Upon heating all compounds decomposed progressively to silver oxide, which was the final product of pyrolysis.
    Źródło:
    Acta Innovations; 2016, 21; 51-59
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bezpośrednia synteza azydków i tioli organicznych pochodnych glikolu etylenowego w zmodyfikowanej reakcji Appela
    Direct synthesis of organic azides and thiols derived from ethylene glycol via modified Appel reaction 1
    Autorzy:
    Stefaniak, M.
    Jasiński, M.
    Urbaniak, K.
    Romański, J.
    Seliger, P.
    Gutowska, N
    Powiązania:
    https://bibliotekanauki.pl/articles/141899.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    synteza organiczna
    tiole
    azydki
    reakcja „click”
    makrocykle
    kompleksy metali
    organic synthesis
    thiols
    azides
    click reaction
    macrocycles
    metal complexes
    Opis:
    Klasyczną metodę konwersji alkoholi pierwszorzędowych w odpowiednie halogenki alkilowe z użyciem trifenylofosfiny oraz tetrahalogenometanu, tzw. reakcję Appela, zaadoptowano do bezpośredniej syntezy terminalnych tioli i azydków organicznych pochodnych glikolu etylenowego oraz jego siarkowego analogu. W kluczowym etapie opisanej procedury one-pot, otrzymane in situ, w reakcji z N-bromosukcynimidem (NBS), odpowiednie dibromopochodne zostały przekształcone w związki docelowe w reakcji z nukleofilem siarkowym lub azotowym. Wybrane diazydki wykorzystano w syntezie nowych układów makrocyklicznych, które przetestowano pod kątem ich właściwości kompleksotwórczych.
    Classical method of conversion of primary alcohols into corresponding alkyl halides by usage of triphenylphosphine and tetrahalogenated methane, so-called Appel reaction, was adopted for the direct synthesis of terminal organic thiols and azides derived from ethylene glycol and its sulfurated analogue. In key step of the presented ‘one-pot’ protocol, corresponding dibromides, generated in situ via reaction with N-bromosuccinimide (NBS), were converted into desired products by treatment with appropriate sulfur or nitrogen nucleophile. A series of diazides and dithiols derived from (poly)ethylene glycols and their sulfur analogues were obtained. Selected diazides were utilized for the construction of novel macrocyclic systems, that were tested incontext of their complexing properties.
    Źródło:
    Chemik; 2014, 68, 7; 592-599
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antybiotyki peptydowe i ich kompleksy z jonami metali
    Peptide antibiotics and their complexes with metal ions
    Autorzy:
    Stokowa-Sołtys, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/171960.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    antybiotyki peptydowe
    metaloantybiotyki
    kompleksy jonów metali
    peptide antibiotics
    metalloantibiotic
    metal ion complexes
    Opis:
    Metal ions are essential for numerous antibiotics. They play a crucial role in the mechanism of action and may be involved in specific interactions with cell membrane or target molecules, such as: proteins and nucleic acids. Due to the fact that complexes usually poses a higher positive charge than free ligands, they might interact more tightly with DNA and RNA molecules. However, complexes may also form during antimicrobial agents application, because a lot of them possess functional groups which can bind metal ions present in physiological fluids. Many recent studies support a hypothesis that drugs may alter the serum metal ions concentration. Moreover, it has been shown that numerous complexes with antibiotics can cause DNA degradation, e.g. bleomycin which form stable complexes with redox metal ions and split the nucleic acids chain via the free radicals mechanism. Therefore, it is widely used in cancer therapy.
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 7-8; 497-522
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Koordynacyjne materiały wybuchowe
    Coordination explosives
    Autorzy:
    Bełzowski, J.
    Wojewódka, A.
    Romanowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1287343.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    materiały wybuchowe
    kompleksy metali przejściowych
    laserowe materiały wybuchowe
    materiały wybuchowe inicjujące
    OPCs
    explosives
    transition metal complexes
    laser ignition primary explosives
    Opis:
    Historia i rozwój materiałów wybuchowych sięgają około dwóch tysiącleci wstecz. Począwszy od prochu czarnego, poprzez nitrozwiązki i nitroestry, aktualne kierunki rozwoju dotyczą m.in. badań nad koordynacyjnymi związkami metali przejściowych, zwanych potocznie solami złożonymi. Prace te doprowadziły do otrzymania szeregu nowych struktur mających cechy materiałów wybuchowych, zarówno kruszących, inicjujących jak i miotających.
    The history and evolution of explosives reach about two millennia backwards. Starting form the black powder, thought nitro-compounds and nitro-esthers, current directions of researches concern coordination transition metal compounds, called compounded salt. This researches leads to a number of new chemical structures which posses explosive parameters, just like blasting or primary explosives and propellants.
    Źródło:
    Chemik; 2010, 64, 1; 21-24
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Korozja trących się elementów układów hamulcowych (tarcze, bębny) pojazdów i możliwości jej minimalizacji
    Corrosion of braking systems friction elements (disks, drums) of vehicles and possibilities of its prevention
    Autorzy:
    Siepracka, B.
    Szumniak, J.
    Nyc, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/347738.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    żeliwo
    kompozyt cierny
    Sywica fenolowo-formaldehydowa
    kompleksy metali
    tarcie
    korozja
    hamulce
    cast iron
    friction composite
    phenol-formaldehyde resin
    metal complexes
    corrosion
    brakes
    Opis:
    W artykule przedstawiono wyniki obserwacji stopnia skorodowania zachodzącego w parze tribologicznej hamulca (tarczowego i bębnowego) w okresie jego postoju w warunkach agresywnego otoczenia miejskiego (przemysłowego). Wyniki przeprowadzonych badań laboratoryjnych, aktywowania powierzchni elementu metalowego przez tarcie z kompozytami, wykazały zróżnicowaną ich podatność korozyjną, w większości przypadków, większą dla powierzchni po tarciu. Wprowadzenie do kompozytu odpowiednich dodatków w ilości 1¸ 2%, np. niektórych kompleksów metali, zwiększa odporność na korozję powierzchni żeliwa kojarzonej z nim tarciowo. Artykuł zawiera przykładowe wyniki badań odporności na korozję przy tarciu żeliwa po żeliwie i kompozytu modyfikowanego.
    This paper presents the results of corrosion damage observations occurring in brake tribological pairs (a disk brake and a drum brake) in the period of their standstill in the condition of aggressive municipal environment (industrial). The results of laboratory investigations performed, and activation of metal element surfaces by friction with composites, demonstrated their different corrosion resistance, in many cases, smaller for surface after friction. An introduction to the composite suitable additives in quantity 1¸2%, for example some metal complexes, increases corrosion resistance of cast iron surface frictional interacting with him. This paper contains some results of corrosion resistance investigations by friction of cast iron with cast iron and composite modified by authors.
    Źródło:
    Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2010, 4; 236-242
    1731-8157
    Pojawia się w:
    Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ditlenek węgla w syntezie organicznej
    Carbon dioxide in organic synthesis
    Autorzy:
    Burczyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/172758.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    wiązanie ditlenku węgla
    surowce odnawialne
    synteza organiczna
    kataliza
    kompleksy metali przejściowych
    carbon dioxide fixation
    renewable resources
    organic synthesis
    catalysis
    transition metal complexes
    Opis:
    Carbon dioxide is an abundant, cheap, almost nontoxic, thermodynamically stable, inert electrophile. Exploitation of CO 2 as a chemical feedstock, although will almost certainly not reduce its atmospheric concentration significantly, aims to generate high-value products and more-efficient processes. In recent years efficient transition-metal complexes have been used to perform homogeneously catalyzed transformations of CO 2 . This paper presents an overview of available catalytic routes for the synthesis of carboxylic acids, lactones, urea and carbamates, linear and cyclic carbonates as well as polycarbonates. Reduction processes of CO 2 are shortly men - tioned as well. C arboxylic acids have been synthesized via : (i) carboxylation of organolithium, organomagnesium (Scheme 2 [35]), organoboron (Scheme 3 [40 -42]), organozinc (Scheme 4 [43, 44]) and organotin (Scheme 5 [45, 46]) compounds; (ii) oxidative cycloaddition of CO 2 to olefins and alkynes (Scheme 6 -10 [47 -50, 57]) catalyzed by Ni(0)-complexes; (iii) transition-metal catalyzed reductive hydrocarboxylation of unsaturated compounds (Scheme 11, 12 [64 -67]); (iv) carboxylation of C-H bond (Scheme 13 [69 -71]). Telomerization of dienes, for instance 1,3-butadiene, and CO 2 in the presence of Ni(II) and Pd(II) complexes leads to lactones and esters of carboxylic acids (Scheme 14, 15 [73 -79]). Nucleophilic ammonia, primary and secondary amines react with CO 2 to give, respectively, urea and carbamic acid esters - carbamates and isocyanates (Scheme 16 -18 [94, 95]), thus eliminating the use of phosgene in their synthesis. CO 2 reacts with alcohols, diols and epoxides in the presence of transition-metal complexes (Fig. 2) and the reaction products are: linear carbonates (Scheme 20, 21 [110 -118]), cyclic carbonates (Scheme 22 -24 [153 -170]) and polycarbonates (Scheme 25, 26, Fig. 3, Tab. 1 [179 -186]). Finally, hydrogenation of CO 2 , leading to the formation of CO, HCOOH, CH 3 OH, CH 4 , C 2 H 6 and C 2 H 4 (Scheme 27), as well as electrochemical and photochemical reductions in the pre - sence of homogeneous and heterogeneous catalysts have been shortly reviewed.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 1-2; 1-53
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The novel metal complexes with ketoprofen. thermal and spectroscopy investigations
    Autorzy:
    Gacki, M.
    Kafarska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/105654.pdf
    Data publikacji:
    2017
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    metal complexes
    non-steroidal anti-inflammatory drugs
    FTIR spectroscopy
    TG/DTG analysis
    kompleksy metali
    niesteroidowe leki przeciwzapalne
    spektroskopia FTIR
    analiza termiczna (TG/DTG)
    Opis:
    The novel metal complexes of ketoprofen (Hket)(1) with general formulae Mn(L)4(2), Co(L)4(3), Ni(L)4(4), and Zn(L)4(5) (where L= Hket, ket) were synthesized and characterized by elemental analysis, FTIR- spectroscopy and thermal decomposition techniques. All IR spectra revealed absorption bands related to the asymmetric (νas) and symmetric (νs) vibrations of carboxylate group. The Nakammoto criteria clearly indicate that this group is bonded in a bidentate-chelate mode. The thermal behavior of complexes was studied by TG, DTG methods under dynamic condition in air. Upon heating, all compounds decompose progressively to metal oxides, which are the final products of pyrolysis.
    Źródło:
    Acta Innovations; 2017, 25; 47-56
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Supramolecular complexes of cobalt(II), manganese(II) and cadmium(II) with bis(terpyridine) ligand as novel luminescent materials
    Autorzy:
    Wałęsa-Chorab, M.
    Gorczyński, A.
    Marcinkowski, D.
    Hnatejko, Z.
    Patroniak, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/779935.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    luminescence
    supramolecular complexes
    transition metal ions
    Opis:
    Self-assembly of N6-donor bis(terpyridine) ligand L with transition metal ions: Co(II), Mn(II) and Cd(II) leads to a formation of three kinds of supramolecular complexes. In the electronic absorption and emission spectra of supramolecular complexes additional bands were observed what was ascribed to the coordination of ligand molecules to metal ions. Luminescence properties of these complexes strongly depend on the kind of metal ions and counter ions. The effective blue luminescence was observed in the case of Mn(II) and Cd(II) complexes in which all N-donor atoms of ligand molecules coordinate with the metal center.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 91-95
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Cr(III) ions from water and wastewater by sorption onto peats and clays occurring in an overburden of lignite beds in central Poland
    Autorzy:
    Kyzioł-Komosińska, J.
    Rosik-Dulewska, Cz.
    Dzieniszewska, A.
    Pająk, M.
    Krzyżewska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/208228.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chromium compounds
    chlorine compounds
    hydrogen bonds
    iron compounds
    isotherms
    lignite
    peat
    sorption
    metal-organic complexes
    water
    wastewater
    związki chromu
    związki chloru
    wiązania wodorowe
    związki żelaza
    izotermy
    węgiel brunatny
    torf
    sorpcja
    kompleksy metaloorganiczne
    woda
    ścieki
    Opis:
    Sorption capacities of low-moor peats and Neogene clays from the overburden of lignite beds in Central Poland for Cr(III) ions as chloride and metalorganic complex ions have been investigated. The binding mechanisms and sorption parameters were determined based on the Freundlich and Langmuir nonlinear sorption isotherms. The sorption capacities of studied materials for Cr(III) ions depended on their properties (porosity, average pore diameters, specific surface area and content of Fe hydroxyoxides) as well as charge of Cr(III) ions, functional groups and their diagonal lengths. Cr(III) ions from chlorides were bound onto sorbents via Coulomb attraction and by Fe hydroxy-oxides. However the complex Cr(III) ions were bound to the sorbent surface via hydrogen bonds between the dye -OH groups and =O of the sorbent functional groups. The equation parameters of sorption isotherms indicate cooperative heterogeneous adsorption at low Cr(III) concentrations and chemisorption at high Cr(III) concentrations
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 5-22
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kompleksy jonów metali d- i f-elektronowych z N-tlenkiem pirydyny i związkami pochodnymi : badania spektroskopowe
    Complexes of d- and f-metal ions with pyridine N-oxide and its derivatives: spectroscopic studies
    Autorzy:
    Hnatejko, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/171812.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    kompleksy jonów metali
    jony metali
    N-tlenki pirydyny
    spektroskopia
    complexes
    metal ions
    pyridine N-oxides
    spectroscopy
    Opis:
    This article reviews results of studies, collected in the literature, related to complexation abilities of pyridine N-oxides, including forms and properties of dand f-metal ion complexes with this group of ligands. In this paper the synthetic pathways of the ligands, based on an oxidation of the corresponding heterocyclic compounds are presented (Scheme 3) [2, 4, 5]. Substituted pyridine N-oxides form an interesting group of compounds, which have found numerous applications [296-299, 314-318]. They have been used in catalysis, crystal engineering, synthesis of coordination polymers, as well as drugs and components in pharmaceutical chemistry [300-309]. Some of them are useful in destroying of microorganisms and the HIV virus [277, 278, 303-307]. Moreover, they are important compounds in the thermal and photochemical oxidation processes [296-299]. The complexes of metal ions with the N-oxide ligands can be formed by binding an oxygen atom of the N›O group, and/or by binding the substituents present in the aromatic ring, e.g. oxygen atoms of carboxylic groups. The complexes can be obtained in monomeric [64, 159], dimeric [58] or polymeric forms [60, 153, 175]. The formation of polymeric forms is more effective when the distance between the positions of COOH and N›O groups in the aromatic ring increases [168]. Complexes of Ln3+ ions and particularly of Eu3+ with pyridine N-oxides are good luminescent materials, better than their heterocyclic counterparts [180, 211]. The emission intensity of europium ions in these systems depends on the efficiency of the LMCT (ligand-metal charge transfer) and LMET (ligand-metal energy transfer) transitions, as well as on electron-donor properties of the substituents present in the pyridine N-oxide ring [37, 132, 155]. A special role in the complexation of Ln3+ ions plays cryptands, which can encapsulate the metal ion. This process protects the metal ion from a penetration of its first coordination sphere by solvent molecules or counterions [245, 246]. The complexes of europium(III) with macromonocyclic, macrobicyclic and acyclic ligands, equipped with photoactive units such as pyridine N-oxide, 2,2'-bipyridine-N,N'-dioxide or 3,3'-biisoquinoline-2,2'-dioxide in solutions, solid states, and incorporated in a silicate matrices by sol-gel method, gained a lot of attention [247-274].
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 5-6; 461-501
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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