title: Poly[[diaqua(μ(2)-4,4'-dipyridyl sulfide-κN:N')(4,4'-dipyridyl sulfide-κN)(2-hydroxy-5-sulfonatobenzoato-κO)nickel(II)] dihydrate].
abstract: The asymmetric unit of the title helical coordination polymer, {[Ni(C(7)H(4)O(6)S)(C(10)H(8)N(2)S)(2)(H(2)O)(2)]·2H(2)O}(n), is comprised of an Ni(II) ion, one 5-sulfosalicylic acid dianion (HSSA), two 4,4'-dipyridylsulfide (4,4'-dps) ligands, and two coordinated and two uncoordinated water mol-ecules. The Ni(II) ion is coordinated by two water mol-ecules, one carboxyl-ate O atom of the HSSA dianion and three N atoms from three 4,4'-dps ligands in a distorted octa-hedral environment. Half of the 4,4'-dps ligands are μ(2)-bridging ligands which link adjacent Ni(II) centers, forming a one-dimensional helical structure along the b axis. This helical structure is further stabilized by O-H⋯O intra- and inter-molecular hydrogen bonds.
authors.affiliation: Department of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan 471022, People's Republic of China.
authors.forename: Zhong-Xiang
authors.initials: ZX
authors.lastname: Du
authors.forename: Jun-Xia
authors.initials: JX
authors.lastname: Li