X-RAY CRYSTAL-STRUCTURE OF OIMIDODIPHOSPHINATO)(TRIPHENYLPHOSPHINE)COPPER(I), (PH(3)P)CU(SPPH(2))(2)N, A MONOCYCLIC INORGANIC (CARBON-FREE)CHELATE RING COMPOUND

The mononuclear (Ph(3)P)Cu(SPPh(2))(2)N compound was prepared by react ing (Ph(3)P)(2)CuNO3 with K[(SPPh(2))(2)N in MeOH/CHCl3 solvent mixtur e. The P-31 NMR spectrum has confirmed the loss of a triphenylphosphin e molecule and the formation of the title compound. The crystal and mo lecular structure was determined by X-ray diffractometry. The compound is monoclinic, space group P2(1)/c, a = 18.826(2), b = 10.619(2), c = 20.587(2) Angstrom, beta = 112.46(2)degrees, V = 3803.6(8) Angstrom(3 ), Z = 4. Th, lattice contains monomeric (Ph(3)P)Cu(SPPh(2))(2)N units , with three-coordinated copper(I) atoms in a distorted trigonal geome try [S(1)-Cu-S(2) 121.5(1), S(1)-Cu-P(3) 126.1(1) and S(2)-Cu-P(3)112. 2(1)degrees]. The dithioligand is monometallic biconnective and within the resulted CuS2P2N inorganic ring the Cu-S [2.215(2), 2.258(2) Angs trom], S-P [2.017(2), 2.012(3) Angstrom] and P-N [1.582(5), 1.592(5) A ngstrom] bond lengths suggest a pi -electron delocalization over the P -N-P fragment. The conformation of the six-membered ring is non-planar .