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. 2014 Aug 4;53(32):8427-31.
doi: 10.1002/anie.201404078. Epub 2014 Jun 20.

Two-coordinate Fe⁰ and Co⁰ complexes supported by cyclic (alkyl)(amino)carbenes

Gaël Ung  1 , Jonathan Rittle, Michele Soleilhavoup, Guy Bertrand, Jonas C Peters
Affiliations

Two-coordinate Fe⁰ and Co⁰ complexes supported by cyclic (alkyl)(amino)carbenes

Gaël Ung et al. Angew Chem Int Ed Engl. .

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 Fe(0) and Co(0) [(CAAC)2M] complexes, prepared by reduction of their corresponding two-coordinate cationic Fe(I) and Co(I) 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.

Keywords: CAAC ligands; carbene complexes; cobalt; iron; low-coordinate complexes.

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