The microwave spectra of 1-propanethiol and its deuterated species (CH3CH2CH2SD) were measured in the frequency region from 8.5 to 35 GHz. Several a-type R-branch transitions for the ground and excited vibrational states of the normal species and for the ground state of the deuterated species were identified, and the following rotational constants in MHz were obtained: A=23429±653, B=2345.29±0.03, and C=2250.18±0.03 for the ground state of the normal species; A=24483±945, B=2346.30±0.04, and C=2253.91±0.04 for the excited state of the normal species, and A=21758±461, B=2306.71±0.03, and C=2217.79±0.03 for the ground state of the deuterated species. The spectrum assigned to the ground vibrational states has been attributed to the T–G rotational isomer, and the excited vibrational state has been ascribed to the –CH2–CH2– torsional motion.
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Ohashi et al. (1977) studied this question.
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