Poly[[diaqua(μ2-4,4′-dipyridyl sulfide-κ2N:N′)(4,4′-dipyridyl sulfide-κN)(2-hydroxy-5-sulfonatobenzoato-κO1)nickel(II)] dihydrate

Abstract

The asymmetric unit of the title helical coordination polymer, {[Ni(C7H4O6S)(C10H8N2S)2(H2O)2]·2H2O}n, is comprised of an NiII ion, one 5-sulfosalicylic acid dianion (HSSA), two 4,4′-dipyridylsulfide (4,4′-dps) ligands, and two coordinated and two uncoordinated water mol­ecules. The NiII ion is coordinated by two water mol­ecules, one carboxyl­ate O atom of the HSSA dianion and three N atoms from three 4,4′-dps ligands in a distorted octa­hedral environment. Half of the 4,4′-dps ligands are μ2-bridging ligands which link adjacent NiII centers, forming a one-dimensional helical structure along the b axis. This helical structure is further stabilized by O—H⋯O intra- and inter­molecular hydrogen bonds.