Si-Fluoro substituted quasisilatranes (N → Si) FYSi(OCH2CH2)2NR |
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| Authors: | Alexander A Korlyukov Mikhail Yu Antipin Aleksander I Albanov Eleonora A Zel’bst |
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| Institution: | a A.N. Nesmeyanov Institute of Organoelement Compounds, 28 Vavilov Street, 119991 Moscow, Russia
b A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Street, 664033 Irkutsk, Russia |
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| Abstract: | The reaction of fluorosilanes XYSiF2 (X = Y = F; X = F, Y = Ph; X = Ph, Y = Me) with diethanolamines and their O-trimethylsilyl derivatives affords novel Si-fluoro substituted quasisilatranes 3, 5 and 9. These compounds were characterized by the multinuclear NMR spectroscopy and X-ray diffraction analysis. Experimental and theoretically calculated electron density distribution functions in crystal structure of 9 have shown that the N → Si coordination bond corresponds to polar bond with pronounced ionic contribution. Calculated N → Si bond order in the compound 9 does not exceed 1/3 of the normal Si-N bond. A strong N → Si coordination bond exists in compounds 3, 5 and 9 the length of which varies in the range 1.98-2.175 Å. |
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| Keywords: | Pentacoordinate silicon Fluorosilanes X-ray diffraction Quantum chemical calculations Electron density distribution |
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