Nuclear magnetic resonance spectra of some silyl and trimethylsilyl pseudohalides

Abstract

Proton, ¹³C, ¹⁵N, and ²⁹Si n.m.r. spectra have been recorded for SiH₃(CN), SiH₃(NCY)(Y = O, S, or Se), and SiMe₃(CN) at room temperature or below, as has the ⁷⁷Se spectrum of SiH₃(NCSe). The spectra show no sign of the presence of other isomers, nor of any intermolecular exchange that is fast on the n.m.r. time scale. The n.m.r. parameters are given, together with T₁ and nuclear Overhauser enhancement measurements, for SiMe₃(CN) at three different temperatures. The spin-rotation contribution to relaxation appears to be dominant.