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Expanding the Chemistry of Cationic N-Heterocyclic Carbenes: Alternative Synthesis, Reactivity, and Coordination Chemistry

Authors

  • Björn Hildebrandt,

    1. Institut für Anorganische Chemie und Strukturchemie, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf (Germany), Fax: (+49) 211-11854
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  • Dr. Stephan Raub,

    1. ZIM – Centre for Information and Media Technology, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf (Germany)
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  • Prof. Dr. Walter Frank,

    1. Institut für Anorganische Chemie und Strukturchemie, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf (Germany), Fax: (+49) 211-11854
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  • Prof. Dr. Christian Ganter

    Corresponding author
    1. Institut für Anorganische Chemie und Strukturchemie, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf (Germany), Fax: (+49) 211-11854
    • Institut für Anorganische Chemie und Strukturchemie, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf (Germany), Fax: (+49) 211-11854
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Abstract

A new synthetic route to complexes of the cationic N-heterocyclic carbene ligand 2 has been developed by the attachment of a cationic pentamethylcyclopentadienylruthenium ([RuCp*]+) fragment to a metal-coordinated benzimidazol-2-ylidene ligand. The coordination chemistry and the steric and electronic properties of the cationic carbene were investigated in detail by experimental and theoretical methods. X-ray structures of three carbene–metal complexes were determined. The cationic ligand 2 is a poorer overall electron donor relative to the related neutral carbene, which is evident from cyclic voltammetry (CV) and IR measurements.

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