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Poly[[hexaaqua(μ2-oxalato-κ4O1,O2:O1′,O2′)bis(μ3-pyridine-2,4-dicarboxylato-κ4N,O1:O1′:O4)dicerium(III)] monohydrate]

Author(s): Fwu Ming Shen | Shie Fu Lush

Journal: Acta Crystallographica Section E
ISSN 1600-5368

Volume: 68;
Issue: 1;
Start page: m21;
Date: 2012;
Original page

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 π–π 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.
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