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Photoinduced Magnetization with a High Curie Temperature and a Large Coercive Field in a Cyano-Bridged Cobalt−Tungstate Bimetallic Assembly

2006; American Chemical Society; Volume: 128; Issue: 16 Linguagem: Inglês

10.1021/ja060510e

1943-2984

Shin‐ichi Ohkoshi, Satoru Ikeda, Toshiya Hozumi, Toshinori Kashiwagi, Kazuhito Hashimoto,

Organic and Molecular Conductors Research

A three-dimensional magnetic material [{CoII(pyrimidine)(H2O)}2{CoII(H2O)2}{WV(CN)8}2](pyrimidine)2· 2H2O is prepared. This compound exhibits a charge-transfer-induced spin transition with a large thermal hysteresis loop of 90 K. Irradiating with light causes the low-temperature phase to exhibit a spontaneous magnetization with a Curie temperature of 40 K and a magnetic hysteresis loop with a coercive field of 12 000 G, which is the highest value reported for a photomagnet. The observed photoinduced magnetization is due to the charge-transfer phase transition from the {CoIIhs(S = 3/2)}{CoIIIls(S = 0)}2−NC−{WIV(S = 0)}2 phase to the {CoIIhs(S = 3/2)}3−NC−{WV(S = 1/2)}2 phase by the irradiation.