期刊
NATURE CHEMISTRY
卷 3, 期 7, 页码 564-569出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nchem.1067
关键词
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资金
- JST
- JSPS
- Global COE Program
- MEXT Japan
- MEXT
- Izumi Science and Technology Foundation
- Asahi Glass Foundation
- Grants-in-Aid for Scientific Research [20675001, 11J06552] Funding Source: KAKEN
The light-induced phase transition between the low-spin (LS) and high-spin (HS) states of some transition-metal ions has been extensively studied in the fields of chemistry and materials science. In a crystalline extended system, magnetically ordering the HS sites of such transition-metal ions by irradiation should lead to spontaneous magnetization. Previous examples of light-induced ordering have typically occurred by means of an intermetallic charge transfer mechanism, inducing a change of valence of the metal centres. Here, we describe the long-range magnetic ordering of the extended Fe-II(HS) sites in a metal-organic framework caused instead by a light-induced excited spin-state trapping effect. The Fe-Nb-based material behaves as a spin-crossover magnet, in which a strong superexchange interaction (magnetic coupling through non-magnetic elements) between photo-produced Fe-II(HS) and neighbouring Nb-IV atoms operates through CN bridges. The magnetic phase transition is observed at 20 K with a coercive field of 240 Oe.
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