Poly[[dodecaaquahexakis(μ2-pyridine-2,5-dicarboxylato)tricopper(II)diytterbium(III)] dihydrate

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.