Poly[triaquatris(μ4-pyridine-3,5-dicarboxylato)dicerium(III)]

Abstract

The asymmetric unit of the title compound, [Ce2(C7H3NO4)3(H2O)3]n, contains two CeIII cations, three pyridine-3,5-dicarboxylate (pyd) anions and three coordinated water molecules. One CeIII cation is coordinated by seven carboxylate O atoms from six pyd anions and two water molecules in a square-face-capped square-antiprismatic geometry. Another CeIII cation is coordinated by seven O atoms from six pdy anions and one water molecule in a bicapped trigonal–prismatic geometry. The pdy anions bridge the CeIII cations, forming the three-dimensional polymeric structure. The crystal structure contains extensive O—H...O, O—H...N and weak C—H...O hydrogen bonds. π–π stacking is present in the crystal structure, the shortest centroid–centroid distance between parallel pyridine rings being 3.509 (4) Å.