Abstract
A mononuclear manganese(V)-oxo complex with tetraamido macrocyclic ligand (TAML), [MnV (O)(TAML)]- (1), is a sluggish oxidant in oxidation reactions. Herein, a mononuclear manganese(V)-oxo TAML cation radical complex, [MnV (O)(TAML+. )] (2), is reported. It was synthesized by reacting [MnIII (TAML)]- with 3.0 equivalents of [RuIII (bpy)3 ]3+ or upon addition of one-electron oxidant to 1 and then characterized thoroughly with various spectroscopic techniques along with DFT calculations. Although 1 is a sluggish oxidant, 2 is a strong oxidant capable of activating C-H bonds of hydrocarbons (i.e., hydrogen atom transfer reaction) and transferring its oxygen atom to thioanisoles and olefins (i.e., oxygen atom transfer reaction).
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