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Unidirectional Photoisomerization of Styrylpyridine for Switching the Magnetic Behavior of an Iron(II) Complex: A MLCT Pathway in Crystalline Solids

Tissot, Antoine
Boillot, Marie-Laure
Pillet, Sébastien
Codjovi, Epiphane
Boukheddaden, Kamel
Published in Journal of Physical Chemistry. C. 2010, vol. 114, no. 49, p. 21715 - 21722
Abstract The photoreactivity of two iron(II)−styrylpyridine frameworks Fe(stpy)4(NCSe)2 (stpy = 4-styrylpyridine) has been investigated for the very first time in a crystalline solid. A quantitative cis-to-trans isomerization of stilbenoids is shown to occur in the confined environment of the inorganic solid. The photochromic reaction was driven by a visible excitation into the metal-to-ligand charge transfer absorption of the high-spin all-cis complex. The solid-state transformation is accompanied by a unit-cell volume increase and an amorphization. Interestingly, the photoproduct formed by irradiating the high-spin all-cis reactant undergoes a spin conversion when the temperature is decreased. This observation is related to the “ligand-driven light-induced spin change” effect in a constrained environment.
Stable URL https://archive-ouverte.unige.ch/unige:14853
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Other version: http://pubs.acs.org/doi/abs/10.1021/jp106583f

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Deposited on : 2011-03-25

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