Microwave Spectra of Thiophene, 2- and 3-Monodeutero, 3,3′-Dideutero, and Tetradeuterothiophene. Structure of the Thiophene Molecule

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Abstract
2‐ and 3‐monodeutero, 3,3′‐dideutero, and tetradeuterothiophene have been prepared and their microwave spectra recorded together with the microwave spectrum of ordinary thiophene (C4H4S). Lines originating from the 4% content of C4H4S34 and the 2% content of C3C13H4S in ordinary thiophene (both the 2‐ and the 3‐C13 species) were also identified. For all isotopic species rotational constants of high accuracy were obtained. The total material is sufficient for a complete determination of all the 8 geometrical parameters of thiophene.
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