Received 29 August 2012
The asymmetric unit of the title polymeric complex, [Cd2(C13H7NO4)(OH)2]n, consists of two independent CdII atoms, one 5-(4-carboxyphenyl)pyridine-2-carboxylate ligand and two hydroxy groups. One CdII atom is six-coordinated by two O atoms from two ligand molecules and by four 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 3-OH groups, forming a distorted square-pyramidal geometry. The two independent CdII atoms are connected by the ligand molecules and the OH groups into a three-dimensional framework. O-HO hydrogen bonds between the OH groups and the carboxylate O atoms are observed.
For related structures and applications of metal complexes with N-heterocyclic multicarboxylate ligands, see: Li et al. (2008); Mahata & Natarajan (2005); Sun et al. (2001); Wang et al. (2009). For the synthesis of the ligand, see: Ben & Gordon (1951); Liu et al. (2005).
Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: IS5190 ).
We are thankful for support from the State Key Laboratory of Electroanalytical Chemistry, Changchun, China.
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