Abstract
The asymmetric unit of the title heterometallic coordination polymer, {[Cu3Yb2(C7H3NO4)6(H2O)12]·2H2O}n, contains one YbIII and two CuII atoms. The CuII atom that is located on an inversion center is N,O-chelated by two pyridine-2,5-dicarboxylate (pdc) anions in a square-planar geometry; the Cu atom located on a general position is N,O-chelated by two pdc anions in the basal plane and is further coordinated by a water O atom at the apical position in a distorted square-pyramidal geometry. The Yb(III) atom is eight coordinated in a distorted square-antiprismatic geometry formed by three carboxylate O atoms from three pdc anions and five water molecules. The pdc anions bridge adjacent Yb(III) and Cu(III) atoms, forming a three-dimensional polymeric structure. The crystal structure contains extensive O—H⋯O hydrogen bonds. π–π stacking is present in the crystal structure, the shortest centroid–centroid distance between parallel pyridine rings of adjacent molecules being 3.646 (3) Å.
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