title: Diguanidinium bis-(μ-2-hydroxy-propane-1,2,3-tricarboxyl-ato)bis-[diaqua-zincate(II)] dihydrate.
abstract: The asymmetric unit of the title compound, (CH(6)N(3))(2)[Zn(2)(C(6)H(5)O(7))(2)(H(2)O)(2)]·2H(2)O, contains one-half of a centrosymmetric dizinc(II) complex anion, one guanidinium cation and one water mol-ecule. Each Zn(II) ion is hexa-coordinated by two citrate anions, one in a bidentate fashion and the second monodentate, and two water mol-ecules in a distorted octa-hedral geometry. Intra-molecular O-H⋯O hydrogen bonds add further stability to the mol-ecular structure. In the crystal structure, mol-ecules are linked into a three-dimensional framework by inter-molecular N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds.
authors.forename: Mohammad T M
authors.initials: MT
authors.lastname: Al-Dajani
authors.forename: Hassan H
authors.initials: HH
authors.lastname: Abdallah
authors.forename: Nornisah
authors.initials: N
authors.lastname: Mohamed
authors.forename: Chin Sing
authors.initials: CS
authors.lastname: Yeap
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun