Synthesis and structure of the mononuclear octacoordinate complex [Pb(Phen)2(iso-Bu2PS2)2] and polynuclear complex [Pb(4,4′-Bipy)(iso-Bu2PS2)2] n : Formation of ribbons and supramolecular assemblies in their crystalline structures

Abstract

Heteroligand complexes [Pb(Phen)2(iso-Bu2PS2)2] (I) and [Pb(4,4′-Bipy(iso-Bu2PS2)2]n (II) were synthesized, and their crystal structures were determined. The crystals of complex I are monoclinic: a = 17.2011(9) A, b = 14.1695(7) A, c = 19.8727(12) A; β = 115.644(1)°, V = 4366.5(4) A3, Z = 4, ρcalcd = 1.500 g/cm3, space group C2/c. The crystals of complex II are triclinic: a = 11.9283(2)A, b = 12.3814(2) A, c = 14.0917(3) A; α = 74.705(1)°, β = 87.240(1)°, γ = 61.448(1)°, V = 1755.86(6) A3, Z = 2, ρcalcd = 1.479 g/cm3, space group P\( \bar 1 \). The structure of complex I consists of mononuclear molecules. The coordination polyhedron of the Pb atom is a distorted tetragonal antiprism N4S4 formed by the bidentate chelating ligands Phen and iso-Bu2PS2−. Continuous zigzag ribbons along the c axis are formed through contacts of the peripheral atoms of the Phen molecules of the adjacent complexes. Polynuclear complex II has a chain structure. The coordination polyhedron of the Pb atom is a distorted octahedron N2S4 formed by the bidentate chelating iso-Bu2PS2− ligands and bidentate bridging 4,4′-Bipy molecules. Short intermolecular contacts between the Pb and S atoms of the adjacent chains in structure II result in the formation of supramolecular two-chain assemblies as volume columns parallel to the b axis. The environment of the Pb atoms in the assembly is formed by pentagonal bipyramids N2S4 + 1.