NMR study of the pyridinium cation motions in (C5H5NH)6Bi4Cl18

被引：8

作者：

Grottel, M ^{[1
]}

Jakubas, R

机构：

[1] Acad Agr, Dept Phys, PL-60637 Poznan, Poland

[2] Univ Wroclaw, Dept Chem, PL-50383 Wroclaw, Poland

来源：

SOLID STATE COMMUNICATIONS | 1999年 / 111卷 / 01期

关键词：

organic crystals; phase transitions; nuclear magnetic resonance;

D O I：

10.1016/S0038-1098(99)00171-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The proton NMR second moment and spin-lattice relaxation time are studied for polycrystalline (C5H5NH)(6)Bi4Cl18 between 100 and 420 K. The in-plane complex reorientation of the cations is described by a three-well potential model with two correlation times. A dynamical inequivalence of three crystallographically independent C5H5NH+ cations is observed. The H-1 NMR studies confirmed that the order-disorder mechanism of the phase transitions at 154 and 122 K was connected with the reorientational motion of the pyridinium cations. (C) 1999 Elsevier Science Ltd. All rights reserved.

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页码：29 / 32

页数：4

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