Poly[[octaaquatetrakis(μ3-pyridine-2,5-dicarboxylato)copper(II)diytterbium(III)] monohydrate]

Abstract

The asymmetric unit of the title heterometallic polymeric coordination compound, {[CuYb2(C7H3NO4)4(H2O)8]·H2O}n, contains one CuII cation located on an inversion center, a YbIII cation, two pyridine-2,5-dicarboxylate (pda) anions, four coordination water molecules a disordered lattice water molecule, which is half-occupied and is located close to an inversion center. The CuII cation is N,O-chelated by two pda anions in the coordination basal plane and further coordinated by two carboxyl O atoms at the apical positions, with an elongated octahedral geometry. The YbIII atom is eight-coordinated in a distorted square-antiprismatic geometry formed by two carboxylate O atoms from two pda anions, and is N,O-chelated by one pda anion and four coordinated water molecules. The pda anions bridge adjacent Yb and Cu cations, forming a three-dimensional polymeric structure. The crystal structure features extensive O—H...O hydrogen bonds. π–π stacking is observed between parallel pyridine rings, the centroid–centroid distance being 3.843 (4) Å.