INTERPRETATION OF THE MAGNETIC-BEHAVIOR OF AN HEXAKIS MANGANESE(II) NITROXIDE OLIGONUCLEAR COMPLEX

被引：6

作者：

BELORIZKY, E ^{[1
]}

机构：

[1] CEN,DEPT RECH FONDAMENTALE,CHIM LAB,F-38041 GRENOBLE,FRANCE

来源：

MOLECULAR PHYSICS | 1992年 / 75卷 / 03期

关键词：

D O I：

10.1080/00268979200100401

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：

A theoretical approach to the magnetic behaviour of an oligonuclear metal-nitroxide complex formed by six Mn (II) ions (S = 5/2) and six free radical ligands (s = 1/2) is performed. The temperature dependence of the magnetic susceptibility is studied and the complexity of an exact calculation is underlined. The low temperature behaviour is, however, shown to be compatible with the existence of a ground energy multiplet with total spin S(t) = 12 corresponding to the minimal energy of the complex for a strong antiferromagnetic coupling. For the high temperature region we develop a model of a cyclic alternate finite chain of classical Mn spins and quantum nitroxide spins. Through the evaluation of the different correlation functions between the various spins it is possible to obtain an analytical expression of the susceptibility leading to the determination of the exchange integral J = 480 K and to a good fit with experiment for 150 K < T < 300 K.

引用

页码：563 / 575

页数：13

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