MOLECULAR-MOTION IN SOLID TETRAETHYLAMMONIUM AND TETRABUTYLAMMONIUM PERCHLORATES

被引：2

作者：

SZAFRANSKA, B ^{[1
]}

PAJAK, Z ^{[1
]}

机构：

[1] ADAM MICKIEWICZ UNIV POZNAN,INST PHYS,UMULTOWSKA 85,PL-61614 POZNAN,POLAND

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 1994年 / 49卷 / 03期

关键词：

NMR; MOLECULAR MOTIONS; PHASE TRANSITIONS;

D O I：

10.1515/zna-1994-0303

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The proton NMR second moment and spin-lattice relaxation time for polycrystalline tetraethyl- and tetrabutylammonium perchlorates have been measured over a wide range of temperatures. Solid-solid phase transitions related to the onset of cation tumbling were found for both compounds and confirmed by DSC. In the low temperature phases methyl-group reorientation was evidenced. For tetrabutylammonium cation a dynamic nonequivalence of one methyl group is found. The geared motion of the alkyl chains related with the onset of successive CH2-group reorientations is suggested.

引用

页码：465 / 468

页数：4