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The divalent silicon species SiBr2 and SiCl2 were produced by the reaction of the corresponding silicon tetrahalides with elemental silicon at temperatures between 900 and 1150°. The I.R. spectra of these molecules trapped in different matrices (Ne, Ar, N2) were observed, and the fundamentals assigned. A set of valence force constants and the bond angles were obtained from accurate measurements of chlorine and silicon isotopic splittings.
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Maaß et al. (1972) studied this question.
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