Acta Cryst. (2007). E63, m2248-m2249  [ doi:10.1107/S1600536807036306 ]

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

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

Abstract: The title salt of a one-dimensional anionic W/S/Ag polymer, {[Y(NO₃)₂(C₆H₁₈N₃OP)₄][WAgS₄]}_n was produced by the reaction of ammonium tetrathiotungstate(VI), silver(I) sulfide and yttrium(III) nitrate in hexamethylphosphoramide. The cation has the same structure as that in the isostructural Yb compound [Cao et al. (2007). Acta Cryst. E63, m2076-m2077]. Together with the two nitrate ligands, the cation is monovalent, which leads to the anionic chain having a monovalent repeat unit. This contrasts with solvent-coordinated rare-earth cations, which are trivalent and induce trivalent repeat units in the anionic chains. The polymeric {[WS₄Ag]^n-}_n anion, with W-Ag-W and Ag-W-Ag angles of 162.684 (19) and 153.833 (10)°, respectively, presents a distorted linear configuration the same as that of the anionic chain in the isostructural Yb compound, suggesting that different rare-earth cations with the same coordination environments have the same influence on the arrangement of their anionic chains.

Online 31 July 2007

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