Abstract
The microwave spectra of silyl methyl ether, SiH 3OCH 3, and its isotopic modifications, SiH 3OCD 3, SiD 3OCH 3, and SiD 3OCD 3, have been observed and assigned. Large splittings arising from the internal rotation of the methyl top and somewhat smaller splittings arising from the internal rotation of the silyl top are observed. The “effective barrier” to internal rotation of the methyl top is approximately 550 cal/mole. The effective barrier to internal rotation of the silyl top is approximately 1100 cal/mole. The internal rotation of the two tops is strongly coupled, but no values for the potential coupling constants have been obtained. The dipole moment has been determined to be 1.15 ± 0.02 D (| μ a | = 0.647 ± 0.01 and | μ b | = 0.95 ± 0.02 D) from measurements of the Stark effect.
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