Ar-matrix stabilization and ir spectra of 1,1-dimethyl-1-silaethylene and its deuteromethyl derivative

Abstract

The IR spectra of the unstable silaethylenes (CH 3) 2SiCH 2 and (CD 3) 2SiCH2 formed in the gas phase from monosilacyclobutanes have been recorded in an argon matrix at 10°K. An assignment of the spectral bands to the unstable species is established by experiments with pyrolysis at higher temperatures and pressures or with a controlled warm-up of the matrix, and also by recording spectra of the same species produced from various precursors. The assignment of the frequency 1003.5 cm −1 to the stretching vibration of the SiC bond in (CH 3) 2Si CH2 is in agreement with force field calculations.