title: 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).
abstract: 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.
authors.affiliation: Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, AB T2N 1N4, Canada.
authors.forename: Maarit
authors.initials: M
authors.lastname: Risto
authors.forename: Jari
authors.initials: J
authors.lastname: Konu
authors.forename: Tristram
authors.initials: T
authors.lastname: Chivers
mesh_terms: D003300:Copper / Q000737:chemistry*; D003460:Crystallization; D007202:Indicators and Reagents; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D016566:Organoselenium Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D012643:Selenium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D007202:Indicators and Reagents; D008024:Ligands; D016566:Organoselenium Compounds; D003300:Copper; D012643:Selenium; C029892:cupric chloride