Microwave spectrum, dipole moment, structure, and internal motion of 1-silabicyclo[2.2.1]heptane.
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概要
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The rotational constants of 1-silabicyclo[2.2.1]heptane in the ground vibrational state were determined to be <I>A</I><SUB>0</SUB>=2744.775 (2) MHz, <I>B</I><SUB>0</SUB>=2662.017 (2) MHz, and <I>C</I><SUB>0</SUB>=2145.994 (2) MHz, with the standard deviations in parentheses. Because the spectrum was very rich, the Stark effects of two transitions were analyzed by a simulation technique. The dipole moments thus obtained are μ<SUB>b</SUB>=0.5±0.1 D, μ<SUB>c</SUB>=0.05±0.01 D, and μ<SUB>t</SUB>=0.5±0.1 D. The observed spectra did not exhibit any anomalies which were due to deviations of the molecular symmetry from C<SUB>s</SUB>. Three structural parameters, Si–C(7), ∠C(2)–Si–C(6), and ∠Si–C(2)–C(3), were adjusted so as to reproduce the rotational constants observed for the ground state. The Si–C(7) bond was found to be longer than Si–C(2) by 0.07 Å. Two vibrational satellites were detected and were assigned to the <I>v</I>=1 and the <I>v</I>=2 states of a torsional mode of the skeleton. A relative-intensity measurement resulted in the excitation energies of 70±25 cm<SUP>−1</SUP> and 160±60 cm<SUP>−1</SUP> for <I>v</I>=1 and <I>v</I>=2, respectively. The molecular structure and the internal motions were discussed in terms of intramolecular forces.
- 公益社団法人 日本化学会の論文
著者
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Hirota Eizi
Department Of Chemistry Faculty Of Science Kyushu University:institute For Molecular Science
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Ikeura Taso
Department Of Chemistry Faculty Of Science Kyushu University
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Tanaka Keiichi
Department Of Anatomy Tottori University School Of Medicine
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Nagai Yoichiro
Department of Applied Chemistry, Faculty of Engineering Gunma University
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Ikeura Taso
Department of Chemistry, Faculty of Science, Kyushu University
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Inaba Shin-ichi
Department of Applied Chemistry, Faculty of Engineering, Gunma University
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