title: Poly[[tetraaqua(mu7-pyridine-2,3,5,6-tetracarboxylato)dicadmium(II)] monohydrate].
abstract: The title compound, {[Cd(2)(C(9)HNO(8))(H(2)O)(4)].H(2)O}(n), consists of two crystallographically independent Cd(II) cations, one tetrabasic pyridine-2,3,5,6-tetracarboxylate (pdtc) anion, four coordinated water molecules and one solvent water molecule. The Cd(II) cations have distorted square-antiprismatic (one pyridine N, six carboxylate O and one water O atom) and octahedral (three carboxylate O and three water O atoms) coordination environments. Each pdtc ligand employs its pyridine and carboxylate groups to chelate and bridge seven Cd(II) cations. The square-antiprismatic coordinated Cd(II) cations are linked by pdtc ligands into a lamellar framework structure, while the octahedral coordinated Cd(II) cations are bridged by the mu(2)-carboxylate O atoms and the pdtc ligands into a chain network that further joins neighbouring lamellae into a three-dimensional porous network. The cavities are filled with solvent water molecules that are linked to the host through complex hydrogen bonding.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors.forename: Sitang
authors.initials: S
authors.lastname: Yan
authors.forename: Lianxu
authors.initials: L
authors.lastname: Shi
authors.forename: Chuande
authors.initials: C
authors.lastname: Wu