Photoinduced Magnetization with a High Curie Temperature and a Large Coercive Field in a Cyano-Bridged Cobalt−Tungstate Bimetallic Assembly
- 30 March 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 128 (16), 5320-5321
- https://doi.org/10.1021/ja060510e
Abstract
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.Keywords
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