FTIR matrix isolation study of carbon-13 substituted SiC2

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Abstract
The products from vaporizing silicon carbide at 2900 K and quenching in argon at 8 K have been studied using Fourier transform infrared spectroscopy. Under the assumption of various possible geometries, calculations based on two vibrations observed at 1741.1 and 824.4 cm−1 were made to predict frequencies for SiC2 singly and doubly substituted with carbon-13. Comparison with the spectra observed on isotopic substitution shows conclusively that these vibrations belong to SiC2, and that the molecule is cyclic (i.e., possesses C2v symmetry) in the ground state. This geometry is in agreement with recent results from a rotational analysis of the band system at 500 nm. Force constants derived in the present study suggest that the silicon atom is singly bonded to two doubly bonded carbon atoms.