SYNTHESES OF DINUCLEAR GOLD(I) RING COMPLEXES CONTAINING 1,1-DICYANOETHENE-2,2-DITHIOLATE-S,S AND BIS(DIPHOSPHINES) AS BRIDGING LIGANDS - X-RAY CRYSTAL-STRUCTURE OF [AU2-MU-(I-MNT)MU-(DPPEE)]

The reaction of [Au2mu-bis(diphosphine)Cl2] with potassium 1,1-dicyano ethene-2,2-dithiolate [K2(i-MNT)], yields the heterobridged complexes: [Au2mu-(i-MNT)mu-(dppee)] (1) (dppee=bis(diphenylphosphinoethylene)), [Au2mu-(i-MNT)mu-(dppe)] (2) (dppe=bis(diphenylphosphino)ethane), [Au 2mu-(i-MNT)mu-(dppb)] (3) (dppb = bis(diphenylphosphino)butane), [Au2m u-(i-MNT)mu-(dppAs)] (4) (dppAs = (diphenylarsino)(diphenylphosphino)e thane). The molecular structure of 1 is described. Complex 1 crystalli zed in the triclinic space group P1BAR with a = 10.451(2), b = 11.774( 1), c = 13.432(2) angstrom, alpha = 65.40(1), beta = 82.30(1), gamma = 77.75(1)-degrees and V = 1466.6(4) angstrom3. The structure features two linear two-coordinate gold(I) centers bridged by the i-MNT ligand on one side and by a bis(diphosphine) ligand on the other forming a di nuclear complex with an Au ... Au distance of 2.867(1) angstrom in a t wisted nine-membered ring structure.