The synthesis and characterization of nickel, cobalt, and iron complexes of the bis(phosphine)carbodicarbene (CDC) ligand 1 is described. The square-planar complexes can be synthesized without the isolation of the deprotonated carbodicarbene ligand,… Click to show full abstract
The synthesis and characterization of nickel, cobalt, and iron complexes of the bis(phosphine)carbodicarbene (CDC) ligand 1 is described. The square-planar complexes can be synthesized without the isolation of the deprotonated carbodicarbene ligand, and three different synthetic methods were used to make these first-row transition-metal compounds. The reaction between ligand 1-BPh4 and Ni(COD)2 afforded the compound [(CDC)Ni(η1-C8H13)][BPh4] (2-BPh4) via the insertion of COD into the Ni–H bond produced by cyclometalation. The complexes [(CDC)MCl]+ for nickel and cobalt were synthesized from the reaction of carbodicarbene ligand 1 with NiCl2 or CoCl2 in the presence of triethylamine. For the synthesis of the iron coordination complex of CDC ligand 1, Fe2Mes4 was used to produce [(CDC)Fe-Mes][BPh4] (5), an intermediate-spin Fe(II) compound. Complexes 3–7 were characterized by spectroscopic methods and X-ray single-crystal diffraction analysis.
               
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