Title |
Isolation of Neutral Mononuclear Copper Complexes Stabilized by Two Cyclic (Alkyl)(amino)carbenes
|
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Published in |
Journal of the American Chemical Society, April 2014
|
DOI | 10.1021/ja502521b |
Pubmed ID | |
Authors |
David S. Weinberger, Nurul Amin SK, Kartik Chandra Mondal, Mohand Melaimi, Guy Bertrand, A. Claudia Stückl, Herbert W. Roesky, Birger Dittrich, Serhiy Demeshko, Brigitte Schwederski, Wolfgang Kaim, Paul Jerabek, Gernot Frenking |
Abstract |
Two (cAAC)2Cu complexes, featuring a two-coordinate copper atom in the formal oxidation state zero, were prepared by reducing (Et2-cAAC)2Cu(+)I(-) with metallic sodium in THF, and by a one-pot synthesis using Me2-cAAC, Cu(II)Cl2, and KC8 in toluene in a molar ratio of 2:1:2, respectively. Both complexes are highly air and moisture sensitive but can be stored in the solid state for a month at room temperature. DFT calculations showed that in these complexes the copper center has a d(10) electronic configuration and the unpaired electron is delocalized over two carbene carbon atoms. This was further confirmed by the EPR spectra, which exhibit multiple hyperfine lines due to the coupling of the unpaired electron with (63,65)Cu isotopes, (14)N, and (1)H nuclei. |
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