Abstract
Raman spectra (liquid and solid) and i.r. spectra (gas and solid) have been measured for samples of trans-1,2-dimethyldiborane and of cis-1,2-dimethyldiborane. The observed spectra have been assigned and a set of fundamentals has been proposed. Methyl torsions have been assigned in the i.r. and Raman spectra of the trans isomer in the solid and a three-fold barrier to internal rotation, 2.61 kcal mol −1, has been calculated. No methyl torsions could be uniquely located for the cis isomer. The fundamentals observed are compared with a calculation due to other workers, and the general agreement is quite good. Previous spectroscopic work on these compounds, thought to be mainly on the cis form, is believed to represent spectra of an equilibrium mixture of both forms.
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