1H and 79Br NMR in 1,4-didecyl-1,4-diazoniabicyclo[2.2.2]octane dibromide and diiodide.
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概要
- 論文の詳細を見る
Temperature dependence of <SUP>1</SUP>H NMR spin-lattice relaxation time was measured in solid 1,4-didecyl-1,4-diazoniabicyclo[2.2.2]octane dibromide and diiodide (C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–Br<SUB>2</SUB> and C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–I<SUB>2</SUB>). <SUP>79</SUP>Br NMR spin-lattice relaxation time and chemical shift measurements in the high-temperature phase were also performed in C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–Br<SUB>2</SUB>. It was found that the cation rotates isotropically, while the anion diffuses at a correlation time of ca. 10<SUP>−8</SUP> s in the high-temperature phase of C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–Br<SUB>2</SUB>. The activation energies for these modes are 30 and 34 kJ mol<SUP>−1</SUP>, respectively. Methyl reorientation is activated in the low-temperature phase (<I>E</I><SUB>a</SUB>=11.8 kJ mol<SUP>−1</SUP> in C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–Br<SUB>2</SUB> and <I>E</I><SUB>a</SUB>=12.0 kJ mol<SUP>−1</SUP> in C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–I<SUB>2</SUB>). Near the phasetransition temperature some motion of decyl chain is observed (<I>E</I><SUB>a</SUB>=57 kJ mol<SUP>−1</SUP> in C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–Br<SUB>2</SUB> and <I>E</I><SUB>a</SUB>=35.5 kJ mol<SUP>−1</SUP> in C<SUB>10</SUB>–DABCO–C<SUB>10</SUB>–I<SUB>2</SUB>).
- 公益社団法人 日本化学会の論文
著者
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Eguchi Taro
Institute Of Chemistry College Of General Education
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Nakayama Hirokazu
Institute Of Chemistry College Of General Education Osaka University
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Shirota Yasuhiko
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Nakamura Nobuo
Department Of Cardiology Seiyu Memorial Hospital
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Chihara Hideaki
Department Of Chemistr Faculty Of Science Osaka University
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Nogami Takashi
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Imamura Kengo
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Nakayama Hirokazu
Institute of Chemistry, College of General Education, Osaka University
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Eguchi Taro
Institute of Chemistry, College of General Education, Osaka University
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