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IR and Raman spectra of CI2SiR 2 (R = Hex n (1), Bu ~ (2)) in liquid, glassy, and polycrystalline states were investigated. In the liquid and glassy states, rotational isomerism about the Si--C and C--C bonds takes place, the compounds being mixtures of con formers.In the crystalline state, only one, the most stable conformer (all-tram in relation to the C--C bonds), persists. Compound 7_. in contrast to 1, was found to crystallize on cooling with great difficulty.

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