VIBRATION-SPECTRA AND NORMAL-COORDINATE A NALYSIS OF DI-TERT-BUTYLSILANES (T)BU(2)SIX(3), X=H, D, F, CL, BR, I

The infrared and Raman vibrational spectra of the di-t-butylsilanes (t )Bu(2)SiX(2) (X = H, D, F, CI, Br, I) were recorded. Using a local sym metry force field for the t-butyl groups, normal coordinate analyses h ave been performed. To study the behaviour of t-butyl groups when the symmetry is lower than C-3 nu, the spectra of (t)BuSiI(2)H and (t)BuSi Br(2)H were included in the calculations.