Microwave spectrum and structure of silyl acetylene

Abstract

The microwave spectra of six isotopic forms of silyl acetylene, SiH3CCH, have been investigated, from which the C3, symmetry of the molecule is confirmed and the structural parameters found110" 12'. The spectrum of the most abundant isotopic form in the first excited state of its lowest frequency vibration has been studied, from which have been deduced the rotational, rotationvibration and centrifugal distortion constants, as well as the Coriolis coupling coefficient and an approximate frequency of the vibration.

The microwave spectrum, harmonic force field, structure, and dipole moment of propiolyl chloride

“…Therefore further assumptions are required to derive a mean- ingful structure. Since the C-H and C s C distances have been found to be nearly identical in a wide range of acetylenic molecules (23,(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39) values of 1.057 f 0.002 A and 1.206 f 0.003 A were initially assumed for these bond lengths; only for fluoroacetylene (29) do the C-H and C-C distances lie outside these ranges. Using the assumed ethynyl group geometry a series of effective structures was calculated for propiolyl chloride.…”