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

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.