title: o-Phenyl-enediammonium bis-(3-carb-oxy-4-hydroxy-benzene-sulfonate).
abstract: In the title salt, C(6)H(10)N(2) (2+)·2C(7)H(5)O(6)S(-), the negative charge of the anion resides on the sulfonate group. In the crystal, the cations and anions are -linked by N-H⋯O and O-H⋯O hydrogen bonds, forming a three-dimensional network. The complete dication is generated by crystallographic twofold symmetry.
authors.affiliation: Department of Chemistry & Materials Engineering, Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu, 215500 Jiangsu, People's Republic of China.
authors.forename: Yun-Sheng
authors.initials: YS
authors.lastname: Ma
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Yang