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Information × Registration Number 0218U000915, 0116U004042 , R & D reports Title Synthesis of new bis(benzo crown ethers) and the study of the formation of supramolecular structures upon their interaction with inorganic and organic substrates for the development of new materials popup.stage_title Head Kirichenko T.I., Registration Date 27-02-2018 Organization A.V. Bogatsky, Physico-Chemical Institute of the National Academy of Sciences of Ukraine popup.description2 Research object - imidazole-containing bis(benzocrown ethers). A purpose of work is synthesis of imidazole-containing bis(benzocrown ethers) and study of their complexation with various cations. Research methods - synthetic, UV, NMR spectroscopy, mass spectrometry, X-ray. The boiling of crown-containing benzyls with substituted benzaldehydes in acetic acid in the presence of ammonium acetate leads to the formation of imidazole-bound bis(benzocrown ethers) with yields of 51-88%, containing a benzene ring in the 2-position of the imidazole ring with various substituents in m- and n-positions. Optimization of the geometry of some imidazole crown ethers and their complexes with sodium and potassium cations by the semiempirical PM6-D3 method is carried out. It has been shown that the obtained crown-containing imidazoles form with alkali and alkaline-earth metal cations as sandwich complexes of 1:1 composition and, in most cases, 1:2 (L:M) complexes with a significantly lower stability constant. More stable complexes form compounds containing 18-member crown-ether rings. Among alkali metal cations, the most stable complexes are observed with potassium and rubidium cations, and with alkaline earth metals with barium cation. Product Description popup.authors Богащенко Т.Ю. Кікоть Л.С. Кириченко Т.І. Кулигіна К.Ю. Ляпунов О.Ю. Яковенко І.С. popup.nrat_date 2020-04-02 Close