Synthesis and crystal structure of [WOS3Ag3Br(PPh3)3]•(OPPh3)

The title compound [WOS3Ag3Br(PPh3)(3)] . (OPPh3)was synthesized and the structure was determined by X-ray diffraction. The crystal belongs to the trigonal system with space group R3, The cell parameters are a = 16.140(3), c = 23.003(4) Angstrom, V = 5189.4(15) Angstrom(3), mu(MoK alpha) = 3.298mm(-1), Z = 3, F(000) = 2598, D-c = 1.694g/cm(3). Final R and wR are 0.0496 and 0.1248 respectively for 1952 (I greater than or equal to 2 sigma(I)) observed reflections. The crystal molecule consists of [WOS3Ag3Br(PPh3)(3)] and OPPh3, where [WOS3Ag3Br(PPh3)(3)] is cubane-like skeletoned by one W atom, three S atoms, three Ag atoms and one Br, and OPPh3 is of a distorted tetrahedron structure with P at the center. The W, O(1) and Br atoms are located on the c(3) axis.