catena-Poly[barium(II)-mu sub(2)-(dimethyl sulfoxide)- K sup(2) O:O-bis (mu sub(2) -2,4,6-trinitrophenolato-K sup (4)O sup(2), O sup(1):O sup(1),O sup(6))]

Abstract

The asymmetric unit of the title barium coordination polymer, [Ba(C sub(6)H sub(2)N sub(3)O sub(7)) sub(2-)(C sub(2)H sub(6)OS)] sub(n,) consists of a barium cation (site symmetry m) and a dimethyl sulfoxide (DMSO) ligand (point group symmetry m) and a 2,4,6-tri-nitro-phenolate anion located in general positions. The S atom and the methyl group of DMSO are disordered over two sets of sites. The DMSO ligand bridges a pair of Ba sup(II) atoms resulting in a chain extending parallel to the a axis. The unique 2,4,6-tri-nitro-phenolate anion also bridges a pair of Ba sup(II) ions via the phenolic oxygen atom, with each Ba sup(II) being additionally bonded to an oxygen atom of an adjacent nitro group. The mu sub(2)-monoatomic bridging binding mode of both types of ligands results in the formation of an infinite chain of face-sharing {BaO sub(10)} polyhedra flanked by the remaining parts of the 2,4,6-tri-nitro-phenolato and DMSO ligands. In the one-dimensional coordination polymer, parallel chains are inter-linked with the aid of C-H...O hydrogen bonds.