Acta Cryst. (2007). E63, m2076-m2077  [ doi:10.1107/S1600536807031480 ]

catena-Poly[[tetrakis(hexamethylphosphoramide-O)bis(nitrato- ²O,O')ytterbium(III)] [silver(I)-di--sulfido-tungstate(VI)(Ag-W)-di--sulfido]]

Y. Cao, J.-F. Zhang, J. Qian and C. Zhang

Abstract: The self-assembly of tetrathiotungstate(VI), silver sulfide and ytterbium(III) nitrate in hexamethylphosphoramide (hmp) resulted in a one-dimensional anionic W/S/Ag polymer, {[Yb(NO₃)₂(C₆H₁₈N₃OP)₄][WAgS₄]}_n. The central Yb coordination polyhedron in the cationic complex [Yb(hmp)₄(NO₃)₂]⁺ is a distorted square antiprism. The [YbO₈] assembly has an approximate fourfold inversion axis along the bisector of one of the chelating nitrate groups. The polymeric anion {[WS₄Ag]^-}_n presents a distorted linear configuration, with W-Ag-W and Ag-W-Ag angles of 160.81 (7) and 153.41 (7)°, deviating significantly from the ideal 180°. The anionic chains in the title compound are similar to those in {N(C₆H₅CH₂)(C₂H₅)₃[MoS₄Ag]}_n: they both have a similar wave-like appearance but have different orientations. The former propagate along the c axis, while the latter have two orientations: one parallel to the a axis and the other parallel to the b axis.

Online 5 July 2007

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