title: Poly[[octa-aqua-tetra-kis-(μ(3)-pyridine-2,5-dicarboxyl-ato)copper(II)diytterbium(III)] monohydrate].
abstract: The asymmetric unit of the title heterometallic polymeric coordination compound, {[CuYb(2)(C(7)H(3)NO(4))(4)(H(2)O)(8)]·H(2)O}(n), contains one Cu(II) cation located on an inversion center, a Yb(III) cation, two pyridine-2,5-dicarboxyl-ate (pda) anions, four coordination water mol-ecules a disordered lattice water molecule, which is half-occupied and is located close to an inversion center. The Cu(II) 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 octa-hedral geometry. The Yb(III) atom is eight-coordinated in a distorted square-anti-prismatic geometry formed by two carboxyl-ate O atoms from two pda anions, and is N,O-chelated by one pda anion and four coordinated water mol-ecules. 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.
authors.forename: Shie Fu
authors.initials: SF
authors.lastname: Lush
authors.forename: Fwu Ming
authors.initials: FM
authors.lastname: Shen