対称Si-Cl伸縮振動の振動数におけるヘキサクロロジシランの異常性および振動の帰属

The symmetric Si-Cl stretching of hexachlorodisilane, 352 cm-1 is found to be anomously low when a comparison with those of some compounds containing SiCl3 groups is made. This anomaly seems due to irltensive coupling of symmetric SiCl3 deformation with symmetric Si-Cl stretching and/or Si-Si stretching mode. On the basis of the above consideration, the vibrational assignments of hexachlorodisilane are tentatively done

エタン,ジメチル・エ-テル,ジメチル・サルファイド,ジメチル・セレナイドおよびジメチル・テルライドの回転-振動スペクトルならびに構造

There are two possible configurations for H3C-X-CH3 (X=O,S,Se,Te), linear or bent C-X-C, the latter having C2v symmetry. For a linear model the methyl groups may be staggered, D3d or eclipsed, D3h. A bent model, C2v allows 21 fundamentals, all of which are active in Raman and 17 of which are active in infrared. This means that a C2v symmetry should have 17 coincidences between Raman and infrared spectra among 21 fundamental frequencies. The obtained spectra indicate the general simplicity of the spectra and the lack of coincidence between Raman and infrared frequencies. In addition, the rotation-vibrational band contours consist of a family of Q branches having an intensity alternation for degenerate infrared ones, which indicates the existence of C3 symmetry about the C-X-C axis of rotation. Consequently, the linear models are strongly supported for H3CXCH3 type molecules and, of the linear configurations, the eclipsed D3h form is eliminated, because a D3h symmetry should indicate the coincidence between Raman and infrared frequencies in E′species. Above all, it seems to the authors sufficient evidence to justify a linear skeleton for H3CXCH3 that an intensity alternation in Q branch sequence of perpendicular band(Eu) is observed. However the final decision must await the results of the further studies, because structure of H3CXCH3 type molecule has been determined from electron diffraction and microwave spectroscopy to be approximately C2v symmetry. The Raman spectra are recorded on JEOL JRS-S1B spectrophotometer using Ar+ laser and the infrared spectra are measured with Shimadzu IR-450 spectrometer, whose gas cell had a path of 10 cm and KRS-5 windows

メタノールの回転-振動スペクトルおよび構造

The authors obtain the infrared rotation-vibrational spectrum of gaseous methanol and the Raman spectrum of liquid one. Actually the infrared as well as the Raman spectrum of methanol has been analyzed on the basis of CS symmetry. However, the present observations show that the vibrational bands of methanol obtained can be explained according to C3v selection rule, that is, it is in agreement with theoretical expectations for C3v model that four parallel type bands are polarized in Raman and have P, Q, and R branches in infrared, whose P-R separations are observed to be 40 cm-1 and estimated to be 43 cm-1 on the basis of the parameters for C3v model. In addition, the obtained spectra of methanol resemble very closely those of acetonitrile, whose symmetry is C3

新たな学校ガバナンスにおける「教育の専門性」の再定位

科学研究費助成事業 研究成果報告書：挑戦的萌芽研究2015-2017課題番号 : 15K1317