Two-Coordinate Fe0 and Co0 Complexes Supported by Cyclic (alkyl)(amino)carbenes

Authors

  • Dr. Gaël Ung,

    1. Division of Chemistry and Chemical Engineering, California Institute of Technology (USA)
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  • Jonathan Rittle,

    1. Division of Chemistry and Chemical Engineering, California Institute of Technology (USA)
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  • Dr. Michele Soleilhavoup,

    1. UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego (USA)
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  • Prof. Guy Bertrand,

    Corresponding author
    1. UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego (USA)
    • Guy Bertrand, UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego (USA)===

      Jonas C. Peters, Division of Chemistry and Chemical Engineering, California Institute of Technology (USA)===

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  • Prof. Jonas C. Peters

    Corresponding author
    1. Division of Chemistry and Chemical Engineering, California Institute of Technology (USA)
    • Guy Bertrand, UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego (USA)===

      Jonas C. Peters, Division of Chemistry and Chemical Engineering, California Institute of Technology (USA)===

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  • This work was supported by the Gordon and Betty Moore Foundation (J.C.P.) and the DOE (DE-FG02-13ER16370) (G.B.). J.R. was supported by a National Science Foundation graduate fellowship. We thank Larry Henling and Michael K. Takase for crystallographic assistance.

Abstract

The CAAC [CAAC=cyclic (alkyl)(amino)carbene] family of carbene ligands have shown promise in stabilizing unusually low-coordination number transition-metal complexes in low formal oxidation states. Here we extend this narrative by demonstrating their utility in affording access to the first examples of two-coordinate formal Fe0 and Co0 [(CAAC)2M] complexes, prepared by reduction of their corresponding two-coordinate cationic FeI and CoI precursors. The stability of these species arises from the strong σ-donating and π-accepting properties of the supporting CAAC ligands, in addition to steric protection.

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