Crystal structure of poly[[hexaqua-1κ⁴O,2κ²O-bis(μ₃-pyridine-2,4-dicarboxylato-1κO²:2κ²N,O^2′;1′κO⁴)cobalt(II)strontium(II)] dihydrate]

Abstract

In the title polymeric complex, {[CoSr(C7H3NO4)2(H2O)6]·2H2O}n, the CoII ion, which is situated on a crystallographic centre of inversion, is six-coordinated by two O atoms and two N atoms from two pyridine-2,4-di­carboxyl­ate (pydc2−) ligands and two terminal water mol­ecules in a slightly distorted octa­hedral geometry, to form a trans-[Co(pydc)2(H2O)2]2− unit. The SrII ion, situated on a C 2 axis, is coordinated by four O atoms from four pydc2− ligands and four water mol­ecules. The coordination geometry of the SrII atom can be best described as a distorted dodeca­hedron. Each SrII ion bridges four [Co(pydc)2(H2O)2]2− units by four COO− groups of four pydc2− ligands to form a three-dimensional network structure. Two additional solvent water mol­ecules are observed in the crystal structure and are connected to the three-dimensional coordination polymer by O—H⋯O hydrogen bonds. Further intra- and intermolecular O—H⋯O hydrogen bonds consolidate the overall structure.