期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 32, 页码 13341-13346出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202003896
关键词
ferrous ion complexes; light conversion; monolayer; spin-crossover; X-ray absorption
资金
- European Union [766726]
Light-induced spin-state switching is one of the most attractive properties of spin-crossover materials. In bulk, low-spin (LS) to high-spin (HS) conversion via the light-induced excited spin-state trapping (LIESST) effect may be achieved with a visible light, while the HS-to-LS one (reverse-LIESST) requires an excitation in the near-infrared range. Now, it is shown that those phenomena are strongly modified at the interface with a metal. Indeed, an anomalous spin conversion is presented from HS state to LS state under blue light illumination for Fe-II spin-crossover molecules that are in direct contact with metallic (111) single-crystal surfaces (copper, silver, and gold). To interpret this anomalous spin-state switching, a new mechanism is proposed for the spin conversion based on the light absorption by the substrate that can generate low energy valence photoelectrons promoting molecular vibrational excitations and subsequent spin-state switching at the molecule-metal interface.
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