catena-Poly[barium(II)-μ(2)-(dimethyl sulfoxide)-κ(2) O:O-bis­(μ(2)-2,4,6-tri­nitro­phenolato-κ(4) O (2),O (1):O (1),O (6))]

The asymmetric unit of the title barium coordination polymer, [Ba(C(6)H(2)N(3)O(7))(2)(C(2)H(6)OS)]( n ), consists of a barium cation (site symmetry m) and a dimethyl sulfoxide (DMSO) ligand (point group symmetry m) and a 2,4,6-tri­nitro­phenolate 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(II) atoms resulting in a chain extending parallel to the a axis. The unique 2,4,6-tri­nitro­phenolate anion also bridges a pair of Ba(II) ions via the phenolic oxygen atom, with each Ba(II) being additionally bonded to an oxygen atom of an adjacent nitro group. The μ (2)-monoatomic bridging binding mode of both types of ligands results in the formation of an infinite chain of face-sharing {BaO(10)} polyhedra flanked by the remaining parts of the 2,4,6-tri­nitro­phenolato and DMSO ligands. In the one-dimensional coordination polymer, parallel chains are inter­linked with the aid of C—H⋯O hydrogen bonds. [Image: see text]