Identification of a Novel η2-Se2 Bonding Mode in Cu(I) Complexes of the Dimeric Selenocarbonyl Dianions, [(EPh2P)2CSeSeC(PPh2E)2]2− (E = S, Se)

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A metathetical reaction between [Li(TMEDA)][(H)C(PPh2Se)2] and CuCl2 in a 2:1 molar ratio afforded the dimeric Cu(I) complex, {Cu2-η(2):η(2)-[(EPh2P)2CSeSeC(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)2CSeSeC(PPh2S)2](2-) with Cu(II) and Cu(I) halides, respectively. Structural characterization of the Cu(I) complexes reveals a unique η(2)-Se2 bonding mode for the generic diselenide ligand system RSe-SeR.