Motion of methylammonium ions in solid CH3NH3NO3 and CH3NH3SCN studied by 1H NMR.
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概要
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The proton spin-lattice relaxation time <I>T</I><SUB>1</SUB> at 20 MHz and the second moment of <SUP>1</SUP>H NMR absorptions at 40 MHz were determined at various temperatures between 77 and 300 K for CH<SUB>3</SUB>NH<SUB>3</SUB>NO<SUB>3</SUB> and CH<SUB>3</SUB>NH<SUB>3</SUB>SCN, and their partially deuterated analogs, CH<SUB>3</SUB>ND<SUB>3</SUB>NO<SUB>3</SUB> and CH<SUB>3</SUB>ND<SUB>3</SUB>SCN. A phase transition was located at 242 K for CH<SUB>3</SUB>NH<SUB>3</SUB>SCN. The fully protonated compounds yielded two <I>T</I><SUB>1</SUB> minima, the low- and high-temperature one of which could be attributed to the reorientation of the CH<SUB>3</SUB> and NH<SUB>3</SUB><SUP>+</SUP> groups, respectively, of the cation about the C–N bond axis. The activation energy was evaluated for these motional modes.
- 公益社団法人 日本化学会の論文
著者
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Ikeda Ryuichi
Department Of Chemistry Faculty Of Engineering Gifu University
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Ishida Hiroyuki
Department of Applied Plant Science, Graduate School of Agricultural Science, Tohoku University
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Nakamura Daiyu
Department of Chemistry Faculty of Science Nagoya University
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