PRESSURE-INDUCED ENHANCEMENT OF THE FERROMAGNETIC INTERMOLECULAR INTERACTION OF AN ALPHA-NITRONYL NITROXIDE ORGANIC RADICAL

被引:33
作者
AWAGA, K
MARUYAMA, Y
机构
[1] Institute for Molecular Science, Myodaiji
关键词
D O I
10.1021/cm00011a014
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 effect of high pressure on the ferromagnetic properties of a crystalline sample of an organic radical, 2-(4-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy 3-oxide (I), has been studied with the use of a combination of a Faraday susceptometer and a Be-Cu high-pressure clamp cell. The magnetic susceptibility of I increases markedly with increasing pressure at low temperatures, and furthermore its increment increases monotonically with decreasing temperature down to about 5 K. The Weiss constant under a pressure of 9 kbar corresponds to a 40% increase in the ferromagnetic intermolecular interaction, and the magnetization at 9 kbar also comes to saturation more rapidly compared with the behavior under an ambient pressure. A simple calculation of the intermolecular overlap integrals between the frontier orbitals can semiquantitatively interpret the pressure-induced enhancement of the ferromagnetic coupling. © 1990, American Chemical Society. All rights reserved.
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页码:535 / 539
页数:5
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