title: catena-Poly[[[diaqua-iron(II)]-μ-pyridine-2,5-dicarboxyl-ato-[tetra-aqua-iron(II)]-μ-pyridine-2,5-dicarboxyl-ato] tetra-hydrate].
abstract: In the crystal structure of the title compound, {[Fe(2)(C(7)H(3)NO(4))(2)(H(2)O)(6)]·4H(2)O}(n), there are two types of coordination for the Fe(II) atoms. One Fe(II) atom is in a distorted octa-hedral N(2)O(4) environment, with two chelating rings from the pyridine-dicarboxyl-ate ligands and two O atoms from the water mol-ecules, while the other is in a distorted octa-hedral O(6) environment with two O atoms from the pyridine-dicarboxyl-ate ligands and four O atoms from the water mol-ecules. Both Fe(II) atoms lie on crystallographic centers of symmetry. The complex possesses an infinite chain structure running along the [101] direction. These chains are inter-connected by the uncoordinated water mol-ecules through O-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, Shangqiu Normal College, 476000 Shangqiu, Henan, People's Republic of China.
authors.forename: Hai-Yun
authors.initials: HY
authors.lastname: Xu
authors.forename: Huai-Ling
authors.initials: HL
authors.lastname: Ma
authors.forename: Mao-Tian
authors.initials: MT
authors.lastname: Xu
authors.forename: Wen-Xian
authors.initials: WX
authors.lastname: Zhao
authors.forename: Bao-Guo
authors.initials: BG
authors.lastname: Guo