Abstract
Microwave spectra of two isotopic species of trans-thioglyoxal, C 2H 2O 32S and C 2H 2O 34S, have been measured in the region 26.5–40.0 GHz. Only a-type transitions were observed. The derived rotational rotational constants (MHz) are A = 50873.(14), B = 2865.354(1), C = 2713.587(1) and A = 50817.(29), B = 2790.107(2), C = 2645.804(3), for the 32S and 34S isotopomers, respectively. The electric dipole moment components, determined from Stark effects measurements, are μ a = 1.112 and μ b = 0.105 D. The inertial defect of −0.07 amuÅ 2 for the 32S isotopomer indicates that the molecule is essentially planar and a fit to the limited set of rotational constants results in a CS bond length of 1.589 Å and a CCS bond angle of 122.7°. The results are compared with predictions from ab initio calculations.
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