title: Structural chemistry of (PPh4)2M(WS4)2 materials.
abstract: In this paper we discuss the structural chemistry of (PPh(4))(2)M(WS(4))(2) (M = Co, Ni, Zn) materials. For M = Ni we and others have been unable to grow single crystals and we report the structure determination from powder diffraction. The material is triclinic (P1, a = 9.3730(2), b = 12.4951(3), c = 12.5189(3) A, alpha = 65.814(1), beta = 83.751(1), gamma = 69.571(1) degrees at T = 293 K). It contains square-planar coordination around Ni. For M = Zn we have isolated two polymorphs. We describe new analysis of the complex superstructure and diffuse scattering observed in the tetragonal polymorph (I4, a = 18.723(4), c = 13.563(4) A at T = 120 K) and the bulk preparation of a monoclinic (P2(1)/c, a = 18.6397(4), b = 15.3693(5), c = 18.9822(5) A, beta = 109.239(2) degrees at T = 293 K) polymorph isostructural with the M = Co material.
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham, UK DH1 3LE.
authors.forename: Clare J
authors.initials: CJ
authors.lastname: Crossland
authors.forename: Ivana Radosavljević
authors.initials: IR
authors.lastname: Evans
authors.forename: John S O
authors.initials: JS
authors.lastname: Evans