Abstract
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.
Highlights
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-dicarboxylate2
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 =
The Eu atom is eightcoordinated with a distorted square-antiprismatic geometry formed by five carboxylate O atoms from five pdc anions and three water molecules
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). One CuII atom is located on an inversion center and is N,O-chelated by two pdc 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,Ochelated 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 =. The Eu atom is eightcoordinated with a distorted square-antiprismatic geometry formed by five carboxylate O atoms from five pdc anions and three water molecules. Interand intramolecular O—H O hydrogen bonding occurs in the structure. – stacking further consolidates the crystal structure, the centroid–centroid distance between parallel pyridine rings being 3.367 (2) Å
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