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    Tytuł:
    Zastosowanie związków kompleksowych platyny, palladu i kobaltu w medycynie. Cz. 1
    Application of coordination compounds of platinum, palladium and cobalt in medicine. Part 1
    Autorzy:
    Pawlak, Marta
    Drzeżdżon, Joanna
    Jacewicz, Dagmara
    Powiązania:
    https://bibliotekanauki.pl/articles/1409835.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki kompleksowe platyny
    związki kompleksowe palladu
    związki kompleksowe kobaltu
    leki przeciwnowotworowe
    coordination compounds of platinum
    coordination compounds of palladium
    coordination compounds of cobalt
    anticancer drugs
    Opis:
    The complex compounds containing metal ions are a group of compounds widely used in medicine. More and more metals are also being used to create cancer drugs or to help with other very serious diseases. Anticancer drugs are a particular use of complex compounds. Many thousands of platinum(II) compounds have been synthesized in cancer therapy, but only six of them have found use in the treatment of cancer. The most popular and the most commonly used compound is cisplatin, it has become the basis for the treatment of bladder, cervical, head, esophagus and many cancers occurring in children. The mechanism of action of platinum(II) and platinum(IV) compounds against cancer cells is to inhibit DNA replication, then RNA transcription and stop the G2 phase of the cell cycle and lead to programmed cell death or apoptosis. Coordination compounds containing more than one metal ion in their composition open new possibilities in the fight against cancer. Pt-DNA connections created by compounds containing at least two metal atoms are different from those formed by cisplatin. The basic dinuclear structure allows for great flexibility in forming DNA-DNA or DNA-protein bonds. The cobalt(III) complexes began to be used to image areas of hypoxia in cancer cells. It is believed, that cobalt(III) complexes undergo bioreduction, which leads to the release of the labile cobalt(II) complex and one or more bioactive ligands. Studies on nitro-Co(III) complexes containing acetylacetone and a nitrogen mustard ligand have shown that it is a particularly effective anti-cancer drug. Due to the fact that many people have cancer new effective anti-cancer drugs with low toxicity and no side effects are still being sought.
    Źródło:
    Wiadomości Chemiczne; 2020, 74, 11-12; 797-822
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura i właściwości fizykochemiczne polimerów koordynacyjnych oraz materiałów typu MOF kadmu(II) i cynku(II)
    Structure and physicochemical properties of coordination polymers and MOF materials based on cadmium(II) and zinc(II)
    Autorzy:
    Pobłocki, Kacper
    Drzeżdżon, Joanna
    Jacewicz, Dagmara
    Powiązania:
    https://bibliotekanauki.pl/articles/1413238.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    polimery koordynacyjne
    sieci metaliczno-organiczne
    związki kadmu(II)
    związki cynku(II)
    MOF
    coordination polymer
    metal organic framework
    cadmium(II)
    compounds
    zinc(II) compounds
    Opis:
    In 1964, J.C. Bailat Jr. was one of the first scientists who use coordination polymers in his research. He established the rules of structure and the composition of compounds containing metal ions and organic ligands connected by coordination bonds to form layered or chain structures. He compared inorganic compounds belonging to polymeric species with organic polymers. The term Metal Organic Frameworks (MOF) was first used in the publication by О. M. Yaghia. Crystalline, microporous structures contain rigid organic ligands (used interchangeably: organic building blocks) that bind metal ions. This is called reticular synthesis. MOF surface area values usually range from 1000 to 10000 m2/g-1, thus exceeding the area values of traditional porous materials such as zeolites and carbons. Metal Organic Frameworks create porous three-dimensional structures, unlike coordination polymers. Inorganic minerals from the aluminosilicate group are used in the widespread heterogeneous catalysis and processes such as: adsorption and ion exchange, while compared to Metal Organic Frameworks, shows a lower potential than zeolites, moreover, the design of structures is less precise and rational due to the lack of shape, size and control functionalization of pores. To date, MOF are the most diverse and most numerous class of porous materials. All aspects have made them ideal structures for storing fuels such as hydrogen and methane. They are perfect for catalytic reactions and are good materials for capturing pollutants, e.g. CO2. The number of publications on coordination polymers (CP), Metal Organic Frameworks (MOF) or a group of hybrid compounds (organic-inorganic) increased tenfold at the turn of 2005, which proves the growing interest in this field by scientists around the world. MOF diversity in terms of structure, size, geometry, functionality and flexibility of MOF has led to the study of over 20,000 different MOF’s over the past decade. The search for new materials consists of combining molecular building blocks with the desired physicochemical properties. To produce a solid, porous material that can be used in the construction of a "molecular scaffold", rigid organic moieties, which are described in the literature as rods, must be combined with multi-core, inelastic inorganic clusters that act as joints (also called SBU secondary building units). By design, multi-core cluster nodes are able to impart thermodynamic stability through strong covalent bonds and mechanical stability due to coordination bonds that can stabilize the position of metals in the molecule. This property contrasts with those of the unstable single coordination polymers. The size and most importantly the chemical environment of the resulting voids are determined by the length and functions of the organic unit. Therefore, adjusting the appropriate properties of the material is made by appropriate selection of the starting materials. The isoretical method made it possible to use MOF structures with large pores (98 Á and low densities (0.13 g/cm3). This method involves changing the size and nature of Metal Organic Frameworks without changing the topology of their substrate. Thanks to this, it was possible to include large molecules such as vitamins (e.g. B12) or proteins (e.g. green fluorescence protein) into their structure and use the pores as reaction vessels. The thermal and chemical stability of many MOFs has made them amenable to functionalization by post-synthetic covalent organic complexes with metals. These properties make it possible to significantly improve gas storage in MOF structures and have led to their extensive research into the catalysis of organic reactions, activation of small molecules such as hydrogen, methane and water, gas separation, biomedical imaging and conductivity. Currently, methods of producing nanocrystals and MOF super crystals for their incorporation into specialized devices are being developed. Crystalline structures of MOF’s are formed by creating strong bonds between inorganic and organic units. Careful selection of MOF components produces crystals of giant porosity, high thermal and chemical stability. These features allow the interior of the MOF to be chemically altered to separate and store gases. The uniqueness of MOF materials is that they are the only solids to modify and increase the particle size without changing the substrate topology.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 7-8; 1041-1073
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Funkcjonalizowane klatkowe silseskwioksany : wybrane strategie syntezy i właściwości koordynacyjne na przykładzie metali 13 grupy
    Functionalized cage-like silsesquioxanes : selected synthetic strategies and coordination properties based on group 13 metals
    Autorzy:
    Szybisty, Aleksandra
    Wytrych, Patrycja
    Ejfler, Jolanta
    John, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1411164.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    silseskwioksany
    POSS
    poliedryczne oligomeryczne silseskwioksany
    13 grupa
    związki koordynacyjne
    silsesquioxanes
    polyhedral oligomeric silsesquioxanes
    group 13
    coordination compounds
    Opis:
    Completely condensed POSS compounds have a cage structure built of Si-O bonds, which makes their electronic properties similar to those of silica and silicates. Moreover, due to their relatively inelastic structure, they impose a coordination geometry on the metal atom, imitating the geometry imposed by silica. Due to the above-mentioned properties, homogeneous models based on silsesquioxanes may not only allow for a better understanding of the nature of heterogeneous catalysts at the molecular level, but also may act as valuable catalysts themselves. Many coordination compounds of main group metals, transition metals and lanthanides have already been obtained. From among the group 13 metals of which this work is concerned, coordination entities of boron, aluminum, gallium, thallium, and indium have been prepared and analyzed so far. They turned out to be suitable models for heterogeneous catalysts, in some cases showing catalytic properties themselves.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 3-4; 293-318
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dichloran(VII) akwatri(4-amino-1,2,4 triazol)disrebranowy inicjujący materiał wybuchowy
    New primary explosive - akwatri(4-amino-1,2,4-triazole)disilver diperchlorate
    Autorzy:
    Borkowski, J.
    Nita, M.
    Warchoł, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/235860.pdf
    Data publikacji:
    2013
    Wydawca:
    Wojskowy Instytut Techniczny Uzbrojenia
    Tematy:
    materiał wybuchowy inicjujący
    związek koordynacyjny
    spłonka pobudzająca
    primary explosive
    coordination compounds
    blasting cap
    Opis:
    Otrzymano i wstępnie scharakteryzowano nowy inicjujący materiał wybuchowy z grupy związków koordynacyjnych. Związek ten składa się z kationów srebra, które pełnią funkcje jonów centralnych, ligandów w postaci cząsteczek 4-amino-1,2,4-triazolu oraz anionów bogatych w aktywny tlen - reszt kwasu chlorowego(VII). Potwierdzeniem proponowanej struktury związku są uzyskane wyniki analizy elementarnej. Nowo otrzymany kompleks scharakteryzowano pod kątem wrażliwości na tarcie, uderzenie i promieniowanie laserowe, jak również zdolności pobudzania detonacji w kruszącym materiale wybuchowym. Za pomocą metody termograwimetrycznej wyznaczono jego odporność termiczną. Ostatecznie na bazie otrzymanego związku opracowano i zbudowano laboratoryjną elektryczną spłonkę pobudzającą.
    As a result of the research, a new primary explosive from a group of coordination compounds was prepared and preliminarily characterized. The obtained compound was analyzed in order to confirm its chemical composition and structure. These analyzes included the determination of C, H, N contents and TG thermogram. Density, sensitivity to friction, impact, laser radiation and detonator tests were also preformed. It is a detonat with moderate sensitivity to thermal (decomposition above 200 °C) and mechanical stimuli (sensitivity to friction 30 N, sensitivity to impact 2 J).
    Źródło:
    Problemy Techniki Uzbrojenia; 2013, 42, 126; 71-77
    1230-3801
    Pojawia się w:
    Problemy Techniki Uzbrojenia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aminy biogenne w aspekcie ich roli w organizmach żywych
    Biogenic amines in their role in living systems
    Autorzy:
    Jastrząb, R.
    Tylkowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/171885.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    poliaminy
    aminy biogenne
    związki kompleksowe
    nowotwory
    polyamines
    biogenic amines
    coordination compounds
    tumors
    Opis:
    Although polyamines (PA) belong to relatively simple aliphatic substances, their role in life processes of animals and plants is of key importance [1–5]. The group of the most important amines, called biogenic ones includes: Spermine (Spm): H2N(CH2)3NH(CH2)4NH(CH2)3NH2 Spermidine (Spd): H2N(CH2)3NH(CH2)4NH2 Putrescine (Put): H2N(CH2)4NH2. Of secondary importance are homologues of biogenic amines, occurring in lower contents in living organisms [2, 6–8]: 1,3-diaminopropan: H2N(CH2)3NH2 Cadaverine: H2N(CH2)5NH2 Homospermidine: H2N(CH2)4NH(CH2)4NH2 Norspermine (3,3,3-tet): H2N(CH2)3NH(CH2)3NH(CH2)3NH2 Thermospermine: H2N(CH2)3NH(CH2)4NH(CH2)4NH2 Caldopentamine: H2N(CH2)3NH(CH2)3NH(CH2)3NH(CH2)3NH2. The first polyamine discovered in a living organism was tetramine, a spermine crystallised out of sperm in 1678 by Van Leewenkeuk [9]. Putrescine was discovered in the end of the 19th century in microbes and then triamine: spermidine was discovered in the beginning of the 20th century [2]. Later studies have shown that in animal cells spermidine and spermine occur at elevated levels, while in prokaryotes spermidine and putrescine contents are dominant. Putrescine, spermidine, 1,3-diaminopropan, homospermidine, norspermidine, and norspermine have been found in many gramnegative bacteria and algae [7, 10, 11]. Total concentration of PA in living organisms is on the order of millimols, however, the concentration of free polyamines is much lower. A low level of free amines follows from the fact that they are involved in noncovalent interactions with biomolecules occurring in living organisms such as nucleic acids, proteins, or phospholipids. High concentrations of non-bonded polyamines have been detected first of all in young molecules in the process of growth, in particular in rapidly proliferating cancer cells [6, 12]. Elevated levels of free polyamines have been observed, e.g. in breast, colon, lung, prostate, and skin tumours, accompanied by changed levels of enzymes responsible for biosynthesis and catabolism of polyamines. Because of the increased level of free polyamines and a tendency of their interaction with nucleic acids and other bioligands, these compounds have become objects of intense study [1, 13–19]. There is no doubt that the regulation of biosynthesis of polyamines and catabolism is one of the most important pathways in the search strategy for chemoprevention and chemotherapeutic drugs [14, 15, 20–36]. The present state of knowledge of these processes, their significance in biological systems, and their application in medicine are presented in subsequent sections of this chapter.
    Źródło:
    Wiadomości Chemiczne; 2016, 70, 1-2; 57-79
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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