Reaction between a carbazole-based mesoionic carbene ligand and
manganese(II) iodide results in the formation of a rare air-stable
manganese(IV) complex after aerobic workup. Cyclic voltammetry
reveals the complex to be stable in five oxidation states. The
electronic structure of all five oxidation states is elucidated chemically, spectroscopically (NMR, high-frequency EPR, UV-Vis, MCD),
magnetically, and computationally (DFT, CASSCF)