Microwave spectrum,structure, dipole moment,and internal rotation of methylsilylsulfide |
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| Affiliation: | 1. Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale del Risorgimento 4, Bologna 40136, Italy;2. Dipartimento di Chimica “Giacomo Ciamician”, Università di Bologna, Via F. Selmi 2, Bologna 40126, Italy;3. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Via Torino 155, Mestre 30172, Italy;2. Department of Chemistry, University of Washington, Seattle, WA 98195, United States;3. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Microwave spectra of methylsilylsulfide and its three isotopically substituted species were measured and their b-type transitions were assigned. The spectra of all the species exhibit doublet structures due to the internal rotation of the methyl group. Using the internal axis method, the potential barriers were determined from the observed A- and E-component frequencies to be 1081.0 ± 3.3, 1073.9 ± 2.0, 1065.1 ± 11.4, and 1076.0 ± 1.9 cal/mol for the normal, CH3SSiD3, CD3SSiH3, and 13CH3SSiH3 species, respectively. The analysis also yielded 3°49′ as the tilt angle of the methyl top. From the rotational constants obtained, a plausible structure was estimated. The molecular electric dipole moments were determined from the second-order Stark effect of some A-component transitions with low- J quantum numbers for the normal and SiD3 species. A comparison of the obtained parameters was made with analogous molecules. |
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