Microwave Spectrum, Structure and Dipole Moment of Ethanethiol. I. <I>Trans</I> Isomer
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概要
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The microwave spectra of <I>trans</I>-ethanethiol and its isotopic species were measured. The <I>r</I><SUB>s</SUB> structure of the <I>trans</I> isomer was determined from the observed moments of inertia. The <I>trans</I> isomer has a symmetrical CH<SUB>3</SUB>group, the parameters for the CH<SUB>2</SUB>SH part of the molecule being approximately equal to those of methanethiol. The C-C bond length, found to be 1.529±0.006Å, is close to that of propane. The angle α(CCS), obtained as 108°34′±19′, is much smaller than that of analogous molecules. Discussion is given for this anomalously small α(CCS) angle. From the Stark shifts, the dipole moment of the <I>trans</I> isomer was determined to be μ<SUB>a</SUB>=1.058±0.023, μ<SUB>b</SUB>=1.146±0.002 and μ<SUB>total</SUB>=1.560±0.032 D, an angle of 28°46′ being made with the bisector of the α(CSH) angle inclining towards the ethyl group. Since the dipole moment of methanethiol makes an angle of 18°30′ with the bisector of the α(CSH) angle, the increase of the angle with the bisector for ethanethiol was concluded to arise from the induction moment of the ethyl group. A brief description is given for the spectra due to the <I>gauche</I> isomer.
- 公益社団法人 日本化学会の論文
著者
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Hayashi Michiro
Department of Chemistry, Faculty of Science, Hiroshima University
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Imaishi Hisae
Department of Chemistry, Faculty of Science, Hiroshima University
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Kuwada Kazunori
Department of Chemistry, Faculty of Science, Hiroshima University
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