MOLECULAR MOTIONS IN THE NOVEL PLASTIC PHASE OF DECAMETHYLFERROCENE STUDIED BY H-1-NMR AND THERMAL MEASUREMENTS

被引:25
作者
KOBAYASHI, T
OHKI, H
IKEDA, R
机构
[1] Department of Chemistry, University of Tsukuba, Tsukuba
来源
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1994年 / 257卷
关键词
D O I
10.1080/10587259408033784
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The (1)HNMR spin-lattice relaxation time and second moment of the resonance line-width in solid decamethylferrocene [(CH3)(5)C]Fe-2 have been measured in temperature ranges 85-540 K, and 300-540 K respectively. The presence of two solid-solid phase transitions were revealed at 397 +/- 1 K and 501 +/- 2 K, by differential scanning calorimetry, Phase I obtainable above 501 K was shown to be a plastic phase, where the isotropic molecular rotation and the translational self-diffusion rapidly take place. In the low-temperature Phases II and III, excitations of the CH3 reorientation, the uniaxial reorientation of the whole molecule about its C-5 axis and the nutation of this C-5 axis were observed.
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页码:279 / 287
页数:9
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