Manipulating Slow Magnetic Relaxation by Light in a Charge Transfer {Fe2Co} Complex |
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Authors: | Junqiu Li Dr. Shuqi Wu Dr. Shengqun Su Dr. Shinji Kanegawa Prof. Osamu Sato |
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Affiliation: | Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, Fukuoka, 819-0395 Japan |
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Abstract: | Some cyanide-bridged complexes are known for exhibiting slow magnetic relaxation behavior in a light-induced metastable state. Herein, an unexpected reverse effect is observed for the first time in the S= {FeIILS-CoIIILS-FeIIILS} (HS=high spin, LS=low spin) ground state of a novel V-shaped trinuclear cyanide-bridged {Fe2Co} complex. In this complex, light-switchable iron-cobalt charge transfer with repeatable off/on switching of slow magnetic relaxation is discovered upon alternating laser irradiation at 785 and 560 nm. An important characteristic of the present compound is that the S= ground state exhibits slow magnetic relaxation before irradiation, whereas this is accelerated after irradiation. This is different from the typical behavior, where the light-induced metastable state exhibits slow magnetic relaxation. |
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Keywords: | charge transfer iron-cobalt photo-switchable slow magnetic relaxation |
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