Bis(2-methyl-1H-imidazol-3-ium) naphthalene-1,5-disulfonate dihydrate.
The asymmetric unit of the title organic salt, 2C(4)H(7)N(2) (+)·C(10)H(6)O(6)S(2) (2-)·2H(2)O, consists of a 2-methyl-imidazolium cation, a half of a naphthalene-1,5-disulfonate anion, which lies about a center of symmetry, and a water mol-ecule. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds link the cations, anions and water mol-ecules into the layers parallel to (111).
Ordered Matter Science Research Center, Southeast University, Nanjing 211189,  People's Republic of China.
Yu-Feng
YF
Wang