Poly[di-mu(3)-hydroxy[mu(4)-5-(4-carboxyphenyl)pyridine-2-carboxylato-kappa N-5, O-2:O-2':O-4:O-4']dicadmium]

The asymmetric unit of the title polymeric complex, [Cd-2(C13H7NO4)(OH)(2)] n, consists of two independent Cd II atoms, one 5-(4-carboxyphenyl) pyridine-2-carboxylate ligand and two hydroxy groups. One Cd-II atom is six-coordinated by two O atoms from two ligand molecules and by four mu(3)-OH groups in a distorted trigonal-prismatic geometry. The other is five-coordinated by one N and two O atoms from two ligands and by two mu(3)-OH groups, forming a distorted squarepyramidal geometry. The two independent Cd-II atoms are connected by the ligand molecules and the OH groups into a three-dimensional framework. O-H center dot center dot center dot O hydrogen bonds between the OH groups and the carboxylate O atoms are observed.