Temperature- and Light-Induced Spin Crossover Observed by X-ray Spectroscopy on Isolated Fe(II) Complexes on Gold

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• 作者：Ben Warner ; Jenny C. Oberg ; Tobias G. Gill ; Fadi El Hallak ; Cyrus F. Hirjibehedin ; Michele Serri ; Sandrine Heutz ; Marie-Anne Arrio ; Philippe Sainctavit ; Matteo Mannini ; Giordano Poneti ; Roberta Sessoli ; Patrick Rosa
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2013
• 出版时间：May 2, 2013
• 年：2013
• 卷：4
• 期：9
• 页码：1546-1552
• 全文大小：371K
• 年卷期：v.4,no.9(May 2, 2013)
• ISSN：1948-7185

文摘

Using X-ray absorption techniques, we show that temperature- and light-induced spin crossover properties are conserved for a submonolayer of the [Fe(H₂B(pz)₂)₂(2,2鈥?bipy)] complex evaporated onto a Au(111) surface. For a significant fraction of the molecules, we see changes in the absorption at the L_2,3 edges that are consistent with those observed in bulk and thick film references. Assignment of these changes to spin crossover is further supported by multiplet calculations to simulate the X-ray absorption spectra. As others have observed in experiments on monolayer coverages, we find that many molecules in our submonolayer system remain pinned in one of the two spin states. Our results clearly demonstrate that temperature- and light-induced spin crossover is possible for isolated molecules on surfaces but that interactions with the surface may play a key role in determining when this can occur.

Keywords:

spin crossover; UHV evaporation; submonolayer; X-ray absorption; iron complexes