The infrared and Raman spectra of dimethylfluorohyphen;, dimethylbromohyphen;, dimethyliodohyphen;, and dimethyldiiodosilane have been recorded from 4000 to 33 cmminus;1and assignments are proposed for all the fundamental vibrations. The far infrared spectra and low frequency Raman spectra were recorded from 350 to 33 cmminus;1for dimethyldifluorohyphen;, dimethylchlorohyphen;, dimethyldichlorohyphen;, dimethyldibromohyphen;, and dimethylsilane. The methyl torsional modes are assigned at 189, 156, 192, 173, 160, 178, 170, and 152 cmminus;1for dimethylfluorohyphen;, dimethyldifluorohyphen;, dimethylchlorohyphen;, dimethylbromohyphen;, dimethyldibromohyphen;, dimethyliodohyphen;, dimethyldiiodohyphen;, and dimethylsilane, with corresponding barriers to internal rotation of 2.39, 1.70, 2.56, 2.07, 1.81, 2.18, 2.02, and 1.51 kcalsol;mole, respectively.
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