A [Mn^III₃O]⁷⁺ Single-Molecule Magnet: the Anisotropy Barrier Enhanced by Structural Distortion

A trinuclear manganese complex, [Mn3O(Me-salox)3(2,4′-bpy)3(ClO4)]·0.5MeCN (1·0.5MeCN; Me-H2salox = 2-hydroxyphenylethanone oxime), has been synthesized and characterized structurally as a [MnIII3(μ3-O)]7+ core. Structural distortion by the twisting of the oxime ligand dominates ferromagnetic interactions within three Mn ions to give an S = 6 ground state as well as to enhance the anisotropy barrier Ueff to 37.5 K.