Abstract
1. In the spectra of (aroyloxymethyl) trifluorosilanes and methyl (aroyloxymethyl) fluorosilanes with the general formula 4-X-C6H4COOCH2Si(Me)3−nFn (n=1–3) the variation of the ΝC=O frequencies with variation of the substituent X in the aromatic ring is significantly larger in the spectra of the cyclic molecules with an intramolecular Si ↞- O coordination bond than for the acyclic molecules containing a free C=O group and a tetracoordinated silicon atom. 2. The frequencies for the stretching vibrations of the COC and SiF groups in the spectra of the molecules with the pentacoordinated silicon atom depend on the nature of the substituent X. Alternation between positive and negative values of the coefficient ρ is observed in the Hammett equations relating the frequencies and the σP values: ρ > 0 (ΝC=O, SiFax), ρ < 0 (ΝCOC).
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Schedule a callMore From: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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