Novel Molecular Magnets Based on Organic Complexes

Akira Miyazaki Department of Chemistry, Tokyo Institute of Technology, Ookayama, Tokyo, 152-8551, Japan

Takashi Umeyama Department of Chemistry, Tokyo Institute of Technology, Ookayama, Tokyo, 152-8551, Japan

Toshiaki Enoki Department of Chemistry, Tokyo Institute of Technology, Ookayama, Tokyo, 152-8551, Japan

Eiji Ogura Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

Yoshiyuki Kuwatani Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

Masahiko Iyoda Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

Hiroyuki Nishikawa Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

Isao Ikemoto Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

Koichi Kikuchi Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

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Abstract

The crystal structure and the physical properties of the radical ion salts BMT-TTFI₂·FeX₄ (X ˭ Br, Cl) and (DMET)₂FeBr₄ are investigated. The structures of BMT-TTFI₂·FeX₄ are characterized as the sheets made of dimerized donor molecules and one-dimensional anion chains. These salts show three-dimensional Curie-Weiss behavior accompanied with antiferromagnetic transitions, with the highest Néel temperature (T _N= 15 K) among the π-d interaction based magnets for the FeBr₄ salt. Within a crystal of (DMET)₂FeBr₄, the donor molecules form one-dimensional columns, between which magnetic anion sheets are inserted. This salt is metallic down to T _MI = 200 K, above which the Curie-Weiss type magnetism is described in terms of donor and anion spins, in spite of the metallic condaction of the salt. Below T _MI the magnetism is governed by anion spins, and an antiferromagnetic phase transition takes place at T _N=3.5 K.

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Novel Molecular Magnets Based on Organic Complexes

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Novel Molecular Magnets Based on Organic Complexes

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