Isolation of Neutral Mononuclear Copper Complexes Stabilized by Two Cyclic (Alkyl)(amino)carbenes
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Journal of the American Chemical Society 136 (17): 6235--6238 (2014)

Two (cAAC)2Cu (cAAC = cyclic (alkyl)(amino)carbene) complexes, featuring a two-coordinate Cu atom in the formal oxidn. state zero, were prepd. by reducing (Et2-cAAC)2Cu+I- with metallic Na in THF, and by a 1-pot synthesis using Me2-cAAC, Cu(II)Cl2, and KC8 in toluene in a molar ratio of 2:1:2, resp. Both complexes are highly air and moisture sensitive but can be stored in the solid state for a month at room temp. DFT calcns. showed that in these complexes the Cu center has a d10 electronic configuration and the unpaired electron is delocalized over two carbene C atoms. This was further confirmed by the EPR spectra, which exhibit multiple hyperfine lines due to the coupling of the unpaired electron with 63,65Cu isotopes, 14N, and 1H nuclei. on SciFinder(R)
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