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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Reversible On-Off Switching of a Single-Molecule Magnet via a Crystal-to-Crystal Chemical Transformation.
Journal of the American Chemical Society 2017 August 31
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 Mn2 Mo molecule [Mn(L)(H2 O)]2 [Mo(CN)7 ]·2H2 O (1) undergoes reversible crystal-to-crystal transformation to a hexanuclear Mn4 Mo2 compound [Mn(L)(H2 O)]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.
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