Abstract
The discovery of a light-induced spin transition at cryogenic temperatures in a series of iron(II) spin-crossover compounds in 1984 has had an enormous impact on spin-crossover research. Apart from being an interesting photophysical phenomenon in its own right, it provided the means of studying the dynamics of the intersystem crossing process between the high-spin and the low-spin state in a series of compounds and over a large temperature range. It could thus be firmly established that intersystem crossing in spin-crossover compounds is a tunnelling process, with a limiting low-temperature lifetime below 50 K and a thermally activated region above 100 K. This review begins with an elucidation of the mechanism of the light-induced spin transition, followed by an in depth discussion of the chemical and physical factors, including cooperative effects, governing the lifetimes of the light-induced metastable states.
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Acknowledgements
Many coworkers, students and friends have helped in developing the ideas outlined in this article. In particular, I thank Harmut Spiering, Philipp Gütlich and Silvio Decurtins for a long-standing partnership, and Jelena Jeftic, Sabine Schenker, Harald Romstedt, Asmaâ Sadki, Roland Hinek, Andreas Vef, Peter Adler, Cristian Enachescu, Mohamed Zerara, Regula Sieber, Nahid Amstutz and Doris Hinz for their contributions. This work was financially supported by the Schweizerische Nationalfonds and the Bundesamt für Forschung und Wissenschaft.
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Hauser, A. Light-Induced Spin Crossover and the High-Spin→Low-Spin Relaxation. In: Spin Crossover in Transition Metal Compounds II. Topics in Current Chemistry, vol 234. Springer, Berlin, Heidelberg. https://doi.org/10.1007/b95416
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DOI: https://doi.org/10.1007/b95416
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