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.
|Number of pages||6|
|Journal||Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences|
|Publication status||Published - Aug 1 1989|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Mathematical Physics
- Physics and Astronomy(all)