MAGNETIC-PROPERTIES OF THE CRYSTALS OF P-(1-OXYL-3-OXIDO-4,4,5,5-TETRAMETHYL-2-IMIDAZOLIN-2-YL) BENZOIC-ACID AND ITS ALKALI-METAL SALTS

被引：71

作者：

INOUE, K ^{[1
]}

IWAMURA, H ^{[1
]}

机构：

[1] UNIV TOKYO,FAC SCI,DEPT CHEM,7-3-1 HONGO,BUNKYO KU,TOKYO 113,JAPAN

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 207卷 / 4-6期

关键词：

D O I：

10.1016/0009-2614(93)89046-K

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 crystals of p-(1-oxyl-3-oxido-4,4,5,5-tetramethyl-2-imidazolin-2-yl)benzoic acid and its alkali metal (Li, Na, and K) salts were prepared. Dimer structures were found in the crystals of the free acid 1 and the lithium salt 1.Li.1/2MeOH by X-ray crystal structure studies. A dimer model was fitted to the observed magnetic susceptibility data of 1 and 1.Li.1/2MeOH in the whole temperature range studied. The optimized exchange coupling parameters 2J/k(B) in the dimers were -6.0 and +31.8 K in 1 and 1.Li.1/2MeOH, respectively. The sodium and potassium salts were paramagnetic and analyzed in terms of the Curie-Weiss relation to have weak Weiss fields of theta = -0.4 and -1.0 K, respectively.

引用

页码：551 / 554

页数：4