H. Matsuura, N. Miyauchi, H. Murata
Feb 1, 1979
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0
Influential Citations
4
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The Raman and infrared spectra of 2-chloro- and 2-bromoethyl methyl sulfides CH3SCH2CH2X (X=Cl and Br) were measured for the liquid and crystalline solid states. The vibrational frequencies of these molecules were calculated by the use of the force constants transferred from unbranched alkyl sulfides and alkyl halides. The rotational isomerism was studied on the basis of the spectral observations and the calculations, and the following conclusions were obtained. (1) In the crystalline solid state, both the chloride and the bromide take the molecular form with the gauche conformation about the (C)S–C(C) axis and the trans conformation about the (S)C–C(X) axis. (2) In addition to this form (GT), three other forms (TG, GG, and TT) coexist in the liquid state, the GT form being the most stable. (3) The sulfur atom is suggested to lower the energy of the trans conformation of the (S)C–C(X) axis.