Hyperfine Interactions

, Volume 159, Issue 1–4, pp 103–108 | Cite as

Phase Transition and Orientational Disorder of the Cation in [(PyO)(H/D)][AuCl4] (PyO = C5H5NO) Crystal

  • T. Asaji
  • E. Akiyama
  • F. Tajima
  • K. Eda
  • M. Hashimoto
  • Y. Furukawa
Resonance Methods


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 Words

hydrogen 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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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • T. Asaji
    • 1
  • E. Akiyama
    • 1
  • F. Tajima
    • 2
  • K. Eda
    • 2
  • M. Hashimoto
    • 2
  • Y. Furukawa
    • 3
  1. 1.Department of Chemistry, Graduate School of Integrated Basic SciencesNihon UniversityTokyoJapan
  2. 2.Department of Chemistry, Faculty of ScienceKobe UniversityNada-kuJapan
  3. 3.Department of Science Education, Graduate School of EducationHiroshima UniversityKagamiyamaJapan

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