Self-Diffusion and Reorientation of Methylammonium Ions in (CH3NH3)2ZnCl4Crystals as Studied by 1H-NMR

Hiroyuki Ishida, Tadashi Iwachido, Naomi Hayama, Ryuichi Ikeda, Mifune Terashima, Daiyu Nakamura

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Abstract

Differential thermal analysis, differential scanning calorimetry, and measurements of the 1H spin-lattice relaxation times and second moments of 1H-NMR absorptions were performed on methylammonium tetrachlorozincate(II) crystals over a wide temperature range. A solid-solid phase transition was located at 477 K. From the 1H-NMR experiments it was found that the cations undergo overall reorientation as well as three dimensional translational self-diffusion in the high-temperature phase. In the low-temperature phase, a 120 reorientational motion of the CH3 and NH3 +groups of the cation about its C - N bond axis was detected. The parameters for the motional modes of the cations in the crystal were evaluated from the analysis of the 1H-NMR experimental results.

Original languageEnglish
Pages (from-to)741-746
Number of pages6
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume44
Issue number8
DOIs
Publication statusPublished - Aug 1 1989

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Mathematical Physics
  • Physics and Astronomy(all)

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