Phase Transition and Orientational Disorder of the Cation in [(PyO)(H/D)][AuCl4] (PyO = C5H5NO) Crystal
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An orientational disorder of the cation in [(PyO)D][AuCl4] crystal was investigated by the 35Cl NQR and 1H NMR measurements. A structural phase transition was found at ca. 70 K from the temperature dependence of the NQR frequencies both in [(PyO)D][AuCl4] and [(PyO)H][AuCl4]. Temperature dependence of the spin-lattice relaxation time T 1 of the NQR of [AuCl4]− could be interpreted by an electric field gradient modulation due to the motion of the cation. Characteristics of T 1 of 35Cl NQR as well as that of 1H NMR suggest a dynamic orientational disorder of the cation.
Key Wordshydrogen bond NQR order–disorder phase transition
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This work was partially funded by a Grant from the Ministry of Education, Culture, Sports, Science and Technology to promote advanced scientific research, a Grant for 2004 from the College of Humanities and Sciences, Nihon University, and Nihon University Individual Research Grant for 2004.
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