A mesoionic carbene complex of manganese in five oxidation states

Benjamin Wittwer; Nicole Dickmann; Stephan Berg; Daniel Leitner; Lorenzo Tesi; David Hunger; Raphael Gratzl; Joris van Slageren; Nicolas I. Neuman; Dominik Munz; Stephan Hohloch

doi:10.1039/D2CC00097K

A mesoionic carbene complex of manganese in five oxidation states†

Benjamin Wittwer,‡^a Nicole Dickmann,‡^b Stephan Berg,‡^b Daniel Leitner,^a Lorenzo Tesi,

^c David Hunger,^c Raphael Gratzl,^a Joris van Slageren,

^c Nicolas I. Neuman,

*^de Dominik Munz

*^fg and Stephan Hohloch

*^a

Author affiliations

* Corresponding authors

^a Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
E-mail: Stephan.Hohloch@uibk.ac.at

^b University of Paderborn, Faculty of Science, Department of Chemistry, Warburger Straße 100, 33098 Paderborn, Germany

^c Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany

^d Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany

^e Instituto de Desarrollo Tecnológico para la Industria Química, INTEC, UNL-CONICET, Predio CONICET Santa Fe Dr Alberto Cassano, Ruta Nacional No 168, Km 0 Paraje El Pozo, (S3000ZAA) Santa Fe, Argentina
E-mail: nneuman@intec.unl.edu.ar

^f Inorganic Chemistry: Coordination Chemistry, Saarland University Campus C4 1, 66123 Saarbrücken, Germany
E-mail: Dominik.Munz@uni-saarland.de

^g Inorganic and General Chemistry, FAU Erlangen-Nürnberg, Egelandstr. 1, 91058 Erlangen, Germany

Abstract

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).

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A mesoionic carbene complex of manganese in five oxidation states†

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