AlBr3 group reorientation in NaAl2Br7 and KAl2Br7 studied by means of 81Br, 27Al NQR and 27Al NMR.
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概要
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<SUP>81</SUP>Br NQR spin-lattice relaxation times for MAl<SUB>2</SUB>Br<SUB>7</SUB> (M=Na and K) were measured from 77 to 373 K and the reorientational activation energies of the AlBr<SUB>3</SUB> groups about Al–Br(bridge) axes were determined. In the case of NaAl<SUB>2</SUB>Br<SUB>7</SUB>, the reorientation of the AlBr<SUB>3</SUB> group was also confirmed by a motional narrowing effect of the <SUP>27</SUP>Al NMR using a single crystal. In order to examine the effect of the reorientation on the Al site, <SUP>27</SUP>Al NQR frequencies in NaAl<SUB>2</SUB>Br<SUB>7</SUB> were observed as a function of temperature by a SEDOR technique. The asymmetry parameter (η) of the electric field gradient (efg) tensor was found to increase at one of the two Al sites with the onset of the reorientation.
- 公益社団法人 日本化学会の論文
著者
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Okuda Tsutomu
Department Of Bio-recycling Faculty Of Engineering Hiroshima Kokusai Gakuin University
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Yamada Koji
Deparment Of Food Science And Technology Faculty Of Agriculture Kyushu University
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Ichiba Sumio
Department of Chemistry, Faculty of Science, Hiroshima University
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Yamada Koji
Department of Chemistry, Faculty of Science, Hiroshima University
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