Crystal and molecular structure of bis[N-(diisopropoxythiophosphoryl)thiobenzamido-S,S ']lead(II)

The crystal and molecular structure of bis[N-(diisopropoxythiophosphoryl)th iobenzamido-S,S']lead(II) is studied by X-ray diffraction analysis: space g roup P (1) over bar, a = 11.104, b = 12.671, c = 13.124 Angstrom, alpha = 9 2.42 degrees, beta = 109.30 degrees, gamma = 99.48 degrees, Z = 2. The stru cture is solved by the direct method and refined anisotropically by the ful l-matrix least-squares method to R = 0.032 for all 4286 unique reflections (CAD-4 automated diffractometer, lambda CuKalpha,). In the individual molec ule of the complex, the coordination polyhedron of the central Pb(II) atom is a distorted trigonal bipyramid with one vacant equatorial position (coor dination number 4), two other equatorial positions being occupied by the th ioamide S atoms, and two axial positions, by the thiophosphoryl S atoms of two bidentate anionic PhC(S)(N) over bar P(S)(OPr-i)(2) ligands. The axial Pb-S bonds are markedly longer than the equatorial ones. Two six-membered c helate rings have the distorted boat conformation.