title: Poly[hemi(ethyl-enediammonium) [di-μ-oxalato-indium(III)] dihydrate].
abstract: In title compound, {(C(2)H(10)N(2))(0.5)[In(C(2)O(4))(2)]·2H(2)O}(n), the unique In(III) ion is coordinated by eight O atoms from four oxalate ligands in a distorted square-anti-prismatic environment. The doubly bis-chelating oxalate ligands act as bridging ligands connecting symmetry-related In(III) ions and forming a three-dimensional open framework structure. Ethyl-enediammonium cations and water mol-ecules occupy the voids within the structure. The unique ethyl-enediammonium cation and one water mol-ecule both lie on a twofold rotation axis. One of the other two water mol-ecules residing on general crystallographic sites was refined as disordered with half occupancy. In the crystal structure, cations and water mol-ecules are linked to the anionic framework via inter-molecular O-H⋯O and N-H⋯O hydrogen bonds.
authors.affiliation: Department of Materials Chemistry, School of Materials Science and Engineering, Key Laboratory of Non-ferrous Metals of the Ministry of Education, Central South University, Changsha 410083, People's Republic of China.
authors.forename: Qiaozhen
authors.initials: Q
authors.lastname: Sun
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Hongwu
authors.initials: H
authors.lastname: Li
authors.forename: Zhi
authors.initials: Z
authors.lastname: Luo