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    Wyświetlanie 1-4 z 4
    Tytuł:
    Trans-1,2-diaminocykloheksan – niezwykła kariera outsidera
    Trans-1,2-diaminocyclohexane – unprecedented outsider’s career
    Autorzy:
    Petryk, M.
    Kwit, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/171507.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    struktura
    chiralność
    konformacja
    synteza asymetryczna
    rozpoznanie molekularne
    structure
    chirality
    conformation
    asymmetric synthesis
    molecular recognition
    Opis:
    An enantiopure trans-1,2-diaminocyclohexane is one of the most widely used chiral diamines in modern organic chemistry. This chiral building block, readily available from waste industrial products, emerges as a major figure in the field of asymmetric synthesis. The unique structural and conformational properties of trans-1,2-diaminocyclohexane make it very useful for the development of new synthetic strategies, taking advantage of its geometrical pre-organization. In this short article, we will highlight the utility of enantiomerically pure trans-1,2-diaminocyclohexane derivatives as broad-range chiral reagents and ligands for catalytic cycles. A brief overview of the aspects of applications in the field of molecular recognition will also be given.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 5-6; 393-442
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie cyklodekstryn w technologii wdrukowania molekularnego
    Application of cyclodextrins in molecular imprinting technology
    Autorzy:
    Pokajewicz, Katarzyna
    Poliwoda, Anna
    Wieczorek, Piotr P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2200556.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    cyklodekstryny
    polimery z nadrukiem cząsteczkowym
    rozpoznanie molekularne
    selektywność
    cyclodextrins
    molecularly imprinted polymers
    molecular recognition
    selectivity
    Opis:
    In the last decade molecular imprinted polymers (MIP) have gained great interest in the area of selective recognition various type substances. Scientific work in this field is carried out very intensively - the methods of synthesis are modified and improved, new types of hydride materials are created, as well as new reagents for synthesis. In this case, cyclodextrins (CD) and their analogues show good molecular recognition ability for its unique physical and chemical properties and suitable cavity structure. As a result, these supramolecular ligands can perform various functions in the MIP technology, and the resulting polymeric materials are characterized by high selectivity and binding specificity (recognition) of analytes structurally matched to the MIP cavity. Of particular importance is the fact that cyclodextrins enable the imprinting not only of low-molecular-weight biologically active compounds, but also of high-molecular molecules (proteins, peptides). The numerous hydroxyl groups available in cyclodextrins are active sites that can form different types of linkages. They can be cross-linked with one another, or they can be derivatized to produce monomers that can form linear or branched networks. This article provides a detailed review of MIPs based on CD and their application in the field of separation science and analytical chemistry in recent years. The discussion is grouped according to the different role of CD in MIPs, that is, functional monomer, carrier modifier, etc.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 7-8; 677--699
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    W poszukiwaniu idealnego chromojonofora
    In pursuit of ideal chromoionofore
    Autorzy:
    Zarzeczańska, Dorota
    Wcisło, Anna
    Smułka, Agata
    Ossowski, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2200576.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    chromojonofory
    chromofor
    antrachinon
    spektrofotometria UV-VIS
    rozpoznanie molekularne
    chromoionophore
    chromophore
    anthraquinone
    UV-VIs spectroscopy
    molecular recognition
    Opis:
    In pursuit for new chromoionophores, it is important to know their functioning, which depends primarily on theirstructure. The structures of chromoionophores were discussed, highlighting the elements that have a significant impact on their operation, i.e. the binding and visualization of metal ion binding. Chromoionophores are composed of a binding and signaling group. Valinomycin, salinomycin and synthetic crown ethers are presented as ionophores. Using the anthraquinone as an example, the function of the chromophore system was defined and discussed. It has been shown that an element connecting the main components of the chromoionophore may also play an important role. The action of chromoionophores is directly related to their acid-base properties, which can influence both ion binding and the visualization of interactions. The examples of aminoanthraquinone derivatives show the influence of the number of groups, position in the anthraquinone ring and the order of amino groups on the basicity of chromoionophores.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 7-8; 663--676
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Od rozpoznania molekularnego do rozdziału racemicznego metodą frakcyjnej krystalizacji soli diastereomerycznych
    From molecular recognition to racemic resolution by fractional crystallization of diastereomeric salts
    Autorzy:
    Białońska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172229.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    rozdział racemiczny
    sole diastereomeryczne
    czynnik rozdzielający
    zróżnicowanie diastereomeryczne
    rozpoznanie molekularne
    racemic resolution
    diastereomeric salts
    resolving agent
    diastereomeric diversification
    molecular recognition
    Opis:
    Synthesis and isolation of enantiopure compounds remains an important challenge in medicinal, pharmaceutical, alimentary as well as material chemistry. Amongst many methods leading to enantiopure compounds, formation and fractional crystallization of diastereomeric salts of an enantiopure resolving agent is the most popular one. Since its discovery many years went by, and yet it has been performed by the trial and error method. Selection of the suitable resolving agent is crucial for racemic resolution efficiency. Hence, this review is concerned with common features of crystal structures of salts, in which resolving agents, frequently used for separation of racemic acids, are involved. Among them, there are crystal structures of salts of primary, secondary and tertiary chiral amines (1-arylethylamines, ephedrine, pseudoephedrine, deoxyephedrine, chinine, chinidine, cinchonine, cinchonidine, strychnine and brucine). In most of them, cations and anions are involved in characteristic systems of hydrogen bonds leading to formation of cationic-anionic self-assemblies. In this respect, brucine and strychnine appear as unique, because presence of anions usually does not affect formation of common cationic self-assemblies stabilized by weak hydrophobic interactions. Comparison of the common structural motifs indicates different factors being crucial in molecular recognition and in diastereomeric diversification. Formation of common hydrogen bonded cationic-anionic self-assemblies plays a dominant role in molecular recognition of a given acid by most of the studied amines. In turn, formation of common cationic self-assemblies stabilized by hydrophobic interaction plays a crucial role in molecular recognition of a given acid by brucine or strychnine. Diastereomeric diversification can be realized in various ways. In extreme cases, when molecular recognition in crystals of particular diastereomeric salts is similar, diastereomeric diversification is governed by different factors, depending on factors governing molecular recognition. Hydrophobic interactions play an important role in diastereomeric diversification when molecular recognition is governed by hydrogen bonds. In turn, when molecular recognition is governed by hydrophobic interactions, different hydrogen bond systems in crystals of particular salts are responsible for their diastereomeric deversification.
    Źródło:
    Wiadomości Chemiczne; 2014, 68, 5-6; 545-562
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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