Inorganic Chemistry, Vol.50, No.2, 406-408, 2011
Identification of a Novel eta(2)-Se-2 Bonding Mode in Cu(I) Complexes of the Dimeric Selenocarbonyl Dianions, [(EPh2P)(2)CSeSeC(PPh2E)(2)](2-) (E = S, Se)
A metathetical reaction between [Li(TMEDA)][(H)C(PPh2Se)(2)] and CuCl2 in a 2:1 molar ratio afforded the dimeric Cu(I) complex, {Cu-2-eta(2):eta(2)-[(EPh2P)(2)CSeSeC(PPh2E)(2))} (E = Se), via a selenium-proton exchange and an internal redox process. The analogous sulfur-containing complex (E = S) was obtained by the reactions of the dianions [(Se)C(PPh2S)(2)](2-) and [(SPh2P)(2)CSeSeC(PPh2S)(2)](2-) with CU(II)) and Cu(I) halides, respectively. Structural characterization of the Cu(I) complexes reveals a unique eta(2)-Se-2 bonding mode for the generic diselenide ligand system RSe-SeR.