Abstract
Microwave spectra of isotopic species α- 13C and β- 13C of tetrahydroselenophene molecules have been investigated and rotational constants determined: A = 5608.98 Mc, B = 2819.532 Mc, C = 2022.624 Mc forα- 13C isotopic species and A = 5695.94 Mc, B = 2770.714 Mc, C = 2009.166 Mc for β- 13C isotopic species. The r s-ring structure was found to be Se-C 2 = 1.963 Å, C 2-C 3 = 1.549 Å, C 3-C 4 = 1.527 Å, ∠ C 5SeC 2 = 90° 44', ∠SeC 2C 3 = 104° 58', ∠C 2C 3C 4 = 106° 52', the angle of twist = 29° 44'.
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