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Light-Induced Spin State Switching in Copper(II)-Nitroxide-Based Molecular Magnet at Room Temperature

Abstract : Molecular magnets Cu(hfac)(2)L-R exhibit an unusual type of photoinduced magnetostructural switching in exchange-coupled copper(II)-nitroxide clusters. Such photoswitching from strongly coupled to weakly coupled spin state (SS -> WS) was recently found to be ultrafast, thus enhancing the interest in these systems and the scope of their potential applications. However, to date such SS -> WS photoswitching was demonstrated only at cryogenic temperatures, being limited by the absence of suitable SS states and short relaxation times at T > 100 K. In this work we selected model compound Cu(hfac)(2)Liso-Pr residing in the mixed SS/WS state at room temperature and investigated it using femtosecond optical spectroscopy. Photoinduced spin dynamics was detected, and an ultrafast SS -> WS photoswitching was for the first time demonstrated at room temperature, constituting an important milestone in the development of copper(II)-nitroxide molecular magnets for practical purposes.
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Submitted on : Wednesday, February 28, 2018 - 2:47:08 PM
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Xu-Dong Che, Maciej Lorenc, Evgeny V. Tretyakov, Victor I. Ovcharenko, Matvey V. Fedin. Light-Induced Spin State Switching in Copper(II)-Nitroxide-Based Molecular Magnet at Room Temperature. Journal of Physical Chemistry Letters, American Chemical Society, 2017, 8 (22), pp.5587-5592. ⟨10.1021/acs.jpclett.7b02497⟩. ⟨hal-01681159⟩

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