| Summary: | The asymmetric unit of the title heterometallic coordination polymer, [Cu3Eu2(C7H3NO4)6(H2O)6]n, contains one EuIII and two CuII atoms, three pyridine-2,4-dicarboxylate (pdc)2− anions and three water molecules. One CuII atom is located on an inversion center and is N,O-chelated by two pdc2− anions in the equatorial plane and further coordinated by two carboxylate O atoms from another two pdc anions in the axial positions, with an elongated octahedral geometry [Cu—O = 2.409 (3) Å in the axial direction]; the other Cu atom is N,O-chelated by two pdc anions in the coordination basal plane and coordinated by a carboxyl O atom at the apical position with a distorted square-pyramidal geometry [Cu—O = 2.359 (3) Å in the apical direction]. The Eu atom is eight-coordinated with a distorted square-antiprismatic geometry formed by five carboxylate O atoms from five pdc anions and three water molecules. The carboxylate anions bridge adjacent Eu and Cu atoms, forming the coordination polymer. Inter- and intramolecular O—H...O hydrogen bonding occurs in the structure. π–π stacking further consolidates the crystal structure, the centroid–centroid distance between parallel pyridine rings being 3.367 (2) Å.
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