title: catena-Poly[[[diaqua-iron(II)]-μ-pyrazine-2,3-dicarboxyl-ato] dihydrate].
abstract: The crystal structure of the title compound, {[Fe(C(6)H(2)N(2)O(4))(H(2)O)(2)]·2H(2)O}(n), was synthesized by a diffusion method. It has a one-dimensional polymeric chain structure and the chains are further connected into a three-dimensional structure by hydrogen bonds. The Fe(II) ion has a distorted octa-hedral coordination environment, with two N and two O atoms from the pyrazine-2,3-dicarboxyl-ate ligands in the equatorial plane and with two water mol-ecules in axial positions. The Fe atom lies on a crystallographic centre of symmetry and a twofold rotation axis passes through the pyrazine ring.
authors.affiliation: Department of Chemistry, Shangqiu Normal College, 476000 Shangqiu, Henan, People's Republic of China.
authors.forename: Haiyun
authors.initials: H
authors.lastname: Xu
authors.forename: Huailing
authors.initials: H
authors.lastname: Ma
authors.forename: Maotian
authors.initials: M
authors.lastname: Xu
authors.forename: Wenxian
authors.initials: W
authors.lastname: Zhao
authors.forename: Baoguo
authors.initials: B
authors.lastname: Guo