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Acta Cryst. (2012). E68, m21-m22  [ doi:10.1107/S1600536811051956 ]

Poly[[hexaaqua([mu]2-oxalato-[kappa]4O1,O2:O1',O2')bis([mu]3-pyridine-2,4-dicarboxylato-[kappa]4N,O1:O1':O4)dicerium(III)] monohydrate]

F. M. Shen and S. F. Lush

Abstract: In the polymeric title compound, {[Ce2(C7H3NO4)2(C2O4)(H2O)6]·H2O}n, the Ce3+ cation is nine-coordinated in a distorted CeNO8 tricapped trigonal-prismatic geometry, formed by three pyridine-2,4-dicarboxylate anions, one oxalate anion and three water molecules. The mid-point of the oxalate anion is located on an inversion center. The oxalate and pyridine-2,4-dicarboxylate anions bridge the Ce3+ cations, forming a two-dimensional polymeric complex parallel to (010). Intermolecular classical O-H...O hydrogen bonding and weak C-H...O hydrogen bonding are present in the crystal structure and [pi]-[pi] stacking [centroid-centroid distance = 3.558 (2) Å] is observed between parallel pyridine rings of adjacent molecules. The uncoordinated water molecule shows an occupancy of 0.5.

Online 7 December 2011

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