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 A. 2008 Published by Elsevier B.V.
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