X-ray crystal structure of (tetraphenyldithioimidodiphosphinato)(triphenylphosphine)copper(I), (Ph3P)Cu(SPPh2)2N, a monocyclic inorganic (carbon-free) chelate ring compound

Article abstract of DOI:10.1016/0277-5387(94)00342-C

The mononuclear (Ph3P)Cu(SPPh2)2N compound was prepared by reacting (Ph3P)2CuNO3 with K[(SPPh2)2N] in MeOH/CHCl3 solvent mixture. The (31)P NMR spectrum has confirmed the loss of a triphenylphosphine molecule and theformation of the title compound. The crystal and molecular structure wa s determined by X-ray diffractometry. The compound is monoclinic, space group P21/c, a=18.826(2), b=10.619(2), c=20.587(2) ?, β=112.46(2)°, V=3803.6(8) ?**3, Z=4. The lattice contains monomeric (Ph3P)Cu(SPPh2)2N units, with three-coordinated copper(I) atoms in a distorted trigonal geometry [S(1)-Cu-S(2) 121.5(1), S(1)-Cu-P(3) 126.1(1) andS(2)-Cu-P(3) 112.2(1)°]. The dithioligand is monometallic biconn ective and within the resulted CuS2P2N inorganic ring the Cu-S [2.215(2), 2.258(2) ?], S-P [2.017(2), 2.012(3) ?] and P-N [1.582(5), 1.592(5) ?] bond lengths suggest a π-electron delocalization over P-N-P fragment. The conformation of the six-membered ring is non-planar.