title: Tetra-aqua-(1,10-phenanthroline)nickel(II) 3,6-dicarboxy-bicyclo-[2.2.2]oct-7-ene-2,5-dicarboxyl-ate.
abstract: In the title compound, [Ni(C(12)H(8)N(2))(H(2)O)(4)](C(12)H(10)O(8)), the Ni(II) ion is six-coordinated by two N atoms from one phenanthroline ligand and by the O atoms of four water mol-ecules in a distorted octa-hedral geometry. In the crystal, inter-molecular O-H⋯O hydrogen bonds form an extensive three-dimensional network, which consolidates the crystal packing.
authors.forename: Yun-Yu
authors.initials: YY
authors.lastname: Liu
authors.forename: Tian-Hui
authors.initials: TH
authors.lastname: Wang
authors.forename: Zhi-Hao
authors.initials: ZH
authors.lastname: Wang
authors.forename: Yu-Jiang
authors.initials: YJ
authors.lastname: Zhuo
authors.forename: Xing-Qi
authors.initials: XQ
authors.lastname: Li