title: Guanidinium (aqua-2κO)(4-hydr-oxy-6-carboxy-pyridine-2-carboxyl-ato-2κO,N,O)(μ-4-hydroxy-pyridine-2,6-dicarboxyl-ato-1:2κO,N,O:O)(4-hydroxy-pyridine-2,6-dicarboxyl-ato-1κO,N,O)dizincate(II) dihydrate.
abstract: The title compound, (CH(6)N(3))[Zn(2)(C(7)H(3)NO(5))(2)(C(7)H(4)NO(5))(H(2)O)]·2H(2)O, has an anionic binuclear complex of Zn(II) balanced with a guanidinium cation. There are two uncoord-inated water mol-ecules in the structure. The asymmetric unit of the compound has two different coordination types (the coordination of Zn1 is distorted trigonal-bipyramidal, while that of Zn2 is distorted octahedral) of Zn(II) in the crystal structure that are bridged to each other via one hypydc(2-) group (hypydcH(2) is 4-hydroxy-pyridine-2,6-dicarboxylic acid). A variety of inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds involving water mol-ecules, cations and anions, and also a weak π-π inter-action [3.798 (1) Å], are responsible for extending the structure into a three-dimensional network.
authors.forename: Hossein
authors.initials: H
authors.lastname: Aghabozorg
authors.forename: Somayeh
authors.initials: S
authors.lastname: Saadaty
authors.forename: Elham
authors.initials: E
authors.lastname: Motyeian
authors.forename: Mohammad
authors.initials: M
authors.lastname: Ghadermazi
authors.forename: Faranak
authors.initials: F
authors.lastname: Manteghi