| Autor: |
Ishida, Hiroyuki, Iwachido, Tadashi, Hayama, Naomi, Ikeda, Ryuichi, Terashima, Mifune, Nakamura, Daiyu |
| Zdroj: |
Zeitschrift für Naturforschung A; August 1989, Vol. 44 Issue: 8 p741-746, 6p |
| Abstrakt: |
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 CH3and 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. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
