5 years ago

Reversible On–Off Switching of a Single-Molecule Magnet via a Crystal-to-Crystal Chemical Transformation

Reversible On–Off Switching of a Single-Molecule Magnet via a Crystal-to-Crystal Chemical Transformation
Xin-Yi Wang, Xiao-Qin Wei, Dong-Qing Wu, Yuan-Zhu Zhang, David Kempe, Dong Shao, Kim R. Dunbar, Fu-Xing Shen, Le Shi
Dynamic molecular crystals are of high interest due to their potential applications. Herein we report the reversible on–off switching of single-molecule magnet (SMM) behavior in a [Mo(CN)7]4– based molecular compound. Upon dehydration and rehydration, the trinuclear Mn2Mo molecule [Mn(L)(H2O)]2[Mo(CN)7]·2H2O (1) undergoes reversible crystal-to-crystal transformation to a hexanuclear Mn4Mo2 compound [Mn(L)(H2O)]2[Mn(L)]2[Mo(CN)7]2 (2). This structural transformation involves the breaking and reforming of coordination bonds which leads to significant changes in the color and magnetic properties. Compound 1 is an SMM with an energy barrier of 44.9 cm–1, whereas 2 behaves as a simple paramagnet despite its higher ground state spin value. The distortion of the pentagonal bipyramidal geometry of [Mo(CN)7]4– in 2 disrupts the anisotropic exchange interactions that lead to SMM behavior in 1.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b07008

DOI: 10.1021/jacs.7b07008

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