Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "schiff base" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-5 z 5
    Tytuł:
    Synthesis, structure and properties of V(V) monooxido complex with ONO tridentate Schiff base
    Autorzy:
    Jurowska, Anna
    Szklarzewicz, Janusz
    Hodorowicz, Maciej
    Gryboś, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/93142.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    vanadium
    complex
    Schiff base
    structure
    5methoxysalicylaldehyde
    phenylacetic hydrazide
    wanad
    kompleks
    baza Schiffa
    struktura
    5 aldehyd metoksysalicylowy
    hydrazyd fenylooctowy
    Opis:
    The oxidovanadium(V) Schiff base complex of formula [VO(L)(EtO)(EtOH)] (where H2L = Schiff base ligand derived from 5-methoxysalicylaldehyde and phenylacetic hydrazide) was synthesized and described. Complex crystalizes in triclinic P-1 space group. Octahedral geometry of the vanadium(V) centre is filed with oxido, ONO L2- ligand and two solvent molecules both in ethoxo and as neutral ethanol form. The complex is neutral, with 5- and 6-memebered ring formed by ONO ligand coordinated in octahedral plane with oxido and EtOH ligands in vertical positions. Two isomers are present in the unit cell, with different position of 5-membered ring versus vertical plane. The elemental analysis, magnetic susceptibility, thermogravimetry and spectroscopy (IR, UV-Vis) measurements were measured and are discussed. The cyclic voltammetry measurements show irreversible processes for vanadium(IV/V) redox system. Thermal stability both in a solid state (TG and SDTA measurements) as well as in solutions (at pH 7.0 and 2.0, studied by UV-Vis spectroscopy) is discussed.
    Źródło:
    Science, Technology and Innovation; 2019, 4, 1; 21-29
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal and long period stability of series of V(V), V(IV) and V(III) complex with Schiff base ligands in solid state
    Autorzy:
    Szklarzewicz, Janusz
    Jurowska, Anna
    Hodorowicz, Maciej
    Gryboś, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/93074.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    vanadium
    complex
    Schiff base
    salicylaldehyde
    hydrazide
    thermogravimetry
    wanad
    kompleks
    baza Schiffa
    aldehyd salicylowy
    hydrazyd
    termograwimetria
    Opis:
    The synthesis and physicochemical properties of three new complexes of vanadium at +5, +4 and +3 oxidation state are described and discussed. The octahedral surrounding of vanadium for V(III) complexes of [V(L1)(HL1)] general formula is filled with two ONO tridentate ligand L, for V(IV) one ONO ligand L, oxido ligand and 1,10-phenanthroline (phen) as a co-ligand are presented in complexes of [VO(L2)(phen)]. For V(V) the complexes of [VO2(L1)(solv)] type were formed. As ligands, the H2L Schiff bases were formed in reaction between 5-hydroxysalcylaldehyde and phenylacetic hydrazide (H2L1) and 3,5- dichlorosalicyaldehyde and 4-hydroxybenzhydrazide (L2). The magnetic moment measurements, in 8 year period, show, that V(III) complexes slowly oxidise to V(IV) with preservation of the nonoxido character of the complexes, while V(IV) complexes were found to be stable. The TG and SDTA measurements indicate, that thermal stability depends mainly on the oxidation state of vanadium. The less thermally stable are the V(V) complexes, while V(IV) and V(III) are stable up to ca. 200oC. In solution, at pH 2 (similar to that in human digestion system), again the V(IV) are the most stable, only at pH 7.0 V(III) complexes had higher stability. The most stable, thus best for pharmaceutical use, are V(IV) complexes.
    Źródło:
    Science, Technology and Innovation; 2019, 4, 1; 30-36
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tridentate hydrazido-hydrazones vanadium complexes. Synthesis, properties and biological activity
    Autorzy:
    Szklarzewicz, Janusz
    Jurowska, Anna
    Hodorowicz, Maciej
    Matoga, Dariusz
    Gryboś, Ryszard
    Filipek, Barbara
    Sapa, Jacek
    Głuch-Lutwin, Monika
    Mordyl, Barbara
    Kazek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/93144.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    vanadium
    complex
    Schiff base
    structure
    hydrazide
    biological activity
    wanad
    kompleks
    baza Schiffa
    Struktura
    hydrazyd
    aktywność biologiczna
    Opis:
    Nine new vanadium complexes, with tridentate Schiff base ligand based on 3,5-di-tertbutyl-2-hydroxybenzaldehyde and different hydrazides, are described and characterized. The X-ray crystal structure of complex 8 shows distorted octahedral geometry of vanadium, with ONO ligand in equatorial position. The tridentate Schiff base ligand forms six membered and five-membered chelate rings at the V(V) acceptor center, with the corresponding bite angles being 82.97(9)˚ and 74.48(9)˚. The molecules are gathered by means of intermolecular OH...N hydrogen bond and layered by π...π interactions involving the pyridine and phenolate rings. Such interactions expand the structure along the crystallographic a axis. The complexes were characterized by the elemental analyses, IR, UV-Vis, EPR spectroscopy, cyclic voltammetry, thermogravimetry and magnetic susceptibility measurements. The stabilization role of co-ligands is discussed. The cytotoxicity versus HepG2 hepatocytes and inhibition of human recombinant PTP1B was studied.
    Źródło:
    Science, Technology and Innovation; 2019, 4, 1; 9-20
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, structure and properties of V(III, IV and V) complexes with ONO Schiff bases
    Autorzy:
    Szklarzewicz, Janusz
    Jurowska, Anna
    Olszewska, Agata
    Hodorowicz, Maciej
    Gryboś, Ryszard
    Kruczała, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/93196.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    vanadium
    complex
    Schiff base
    oxidation state
    structure
    IR
    UV-Vis
    EPR
    wanad
    kompleks
    baza Schiffa
    stan utlenienia
    struktura
    Opis:
    The synthesis and physicochemical properties of vanadium(III,IV,V) complexes with Schiff base ligands based on 3,5-dibromo-4-methoxy-salicylaldehyde and phenylacetic hydrazide (H2L1), 5-chlorosalicylaldehyde and 4-hydroxybenzhydrazide (H2L2) and 5- chlorosalicylaldehyde and 2-hydroxybenzhydrazide (H2L3) were presented. The formulas of the complexes {[V(L1)(HL2)]·EtOH (1), [VO(L2)(phen)]·2H2O (2) and [VO(L3)(EtO)] (3)} were proposed based on the elemental analysis, IR and UV-Vis spectra. Additionally, the IR and UV-Vis spectra (in solvents as well as in a solid state) have been discussed from the vanadium oxidation state point of view. The single crystal structure of 3 shows triclinic, P-1 space group, structure is stabilized by hydrogen bonds and strong π-π stacking interactions. The oxidation state of the metal centre was also confirmed by the magnetic susceptibility measurements. The stability of the complexes was measured in pH = 7.00 and in pH = 2.00 which allows to evaluate the use of these compounds as insulin mimetic compounds.
    Źródło:
    Science, Technology and Innovation; 2019, 4, 1; 37-46
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, structure and properties of V(IV) complex with N’-[(E)-(2,3-dihydroxyphenyl)metylidene]-2- phenylacetohydrazide
    Autorzy:
    Szklarzewicz, Janusz
    Jurowska, Anna
    Hodorowicz, Maciej
    Gryboś, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/93158.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    vanadium
    complex
    Schiff base
    structure
    2,3-dihydroxybenzaldehyde
    phenylacetic hydrazide
    wanad
    kompleks
    baza Schiffa
    Struktura
    2,3-dihydroksybenzaldehyd
    hydrazyd fenylooctowy
    Opis:
    The synthesis and physicochemical properties of new vanadium(IV) complex of formula [VO(L)(phen)] is described. The L denotes ONO tridentate Schiff base derived from 2,3-dihydroxybenzaldehyde and phenylacetic hydrazide, while phen = 1,10-phenanthroline used as a co-ligand to stabilize the V(IV) oxidation state. The single crystal X-Ray crystal structure indicates on octahedral geometry of vanadium centre, with 1,10-phenanthroline nitrogen trans to the V=O bond. The complex crystalizes in a monoclinic P21/c space group, very unusual is that only one isomer is present in the crystal structure. The structure is stabilized by very weak hydrogen bonds and H··π and π···π interactions. The phenyl ring of hydrazide is strongly curved from ONO ligand plane by 70.95˚. The spectroscopic characterization (IR, UV-Vis) as well as the cyclic voltammetry measurements are presented and discussed
    Źródło:
    Science, Technology and Innovation; 2019, 4, 1; 1-8
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies