Magnetic Exchange Across the Cyanide Bridge
作者:
Høgni Weihe,
HansU. Güdel,
期刊:
Comments on Inorganic Chemistry
(Taylor Available online 2000)
卷期:
Volume 22,
issue 1-2
页码: 75-103
ISSN:0260-3594
年代: 2000
DOI:10.1080/02603590008050864
出版商: Taylor & Francis Group
关键词: cyano bridge;molecular magnetic materials;Preussian Blue analogs;magnetic exchange;exchange interaction;magneto-structural correlation;semi-empirical modeling of critical tempzratures
数据来源: Taylor
摘要:
The superexchange interaction in cyano-bridged transition metal dimers is analysed by a valence bond configuration interaction model in combination with fourth order perturbation theory. Ferro- and antiferromagnetic contributions to the exchange splitting are expressed in terms of metal-ligand hybridization matrix elements, metal-to-ligand, lig-and-to-metal, metal-to-metal charge transfer energies, and intra-atomic exhange integrals. The formalism is simplified and we arrive at a two-parameter model, with which it is possible to estimate magnetic ordering temperatures of cubic stoichiometric Prussian Blue like phases containing first row transition metals. The relevance and applicability of our theoretical results is demonstrated on critical temperatures reported in the literature. The model accounts for both ferri- and ferromagnetic ordering temperatures. It is found that cyanide is an efficient mediator of exchange due to the participation of the π and π* orbitals to equal extent.
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