Inclusion compounds: The products of the interaction of silicon,germanium and boron fluorides with crown ethers |
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Authors: | Yurii A Simonov Marina S Fonari Janusz Lipkowski Vladimir O Gelmboldt Edward V Ganin |
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Institution: | (1) Institute of Applied Physics, Academy of Sciences of Moldova, 277028 Kishinev, Moldova;(2) Institute of Physical Chemistry, Academy of Sciences of Poland, 01-244, Warsaw, Poland;(3) Institute of Environmental and Human Protection, Odessa State University, 270100 Odessa, Ukraine |
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Abstract: | This review deals with the problem of the interaction of Si(IV), Ge(IV) and B(III) fluorides with crown ethers and their aza analogues. The crystallographic structures have been determined of the stable products obtained by the interaction of H2SiF6 solution with the following crown ethers: 18-crown-6 (18C6), monoaza-18C6 (MA18C6), 1,10-diaza-18C6 (DA18C6) and 1,7-diaza-15C5 (DA 15C5). The complexes obtained are stabilized by a system of H-bonds of the O-H... O, N-H. ... O, N-H...F and O-H ... F types. For H2GeF6 the adducts obtained are similar to those obtained using H2SiF6. The crystal structures of three new boron fluoride-containing complexes with 18-membered crown ethers are also described. During macrocycle complexation the guest entities undergo chemical transformations which are stabilized by creation of the H- bond system. The results of vibrational and NMR spectra are also discussed.Presented at the Sixth International Seminar on Inclusion Compounds, Istanbul, Turkey, 27–31 August, 1995. |
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Keywords: | Molecular recognition crystalline inclusion complexes X-ray crystal structures H-bonding crown ethers |
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