title: Bis(trimethyl-ammonium) naphthalene-1,5-disulfonate.
abstract: The asymmetric unit of the title compound, 2C(3)H(10)N(+)·C(10)H(6)S(2)O(6) (2-), contains a half-anion, which is completed by inversion symmetry, and one cation. The cations and anions are associated via strong N-H⋯O(sulfonate) hydrogen-bonding inter-actions, forming cation-anion-cation groups. Secondary inter-actions such as C-H(ammonium)⋯O(sulf-on-ate) and van der Waals inter-actions link the cations and anions together in a three-dimensional crystal structure, with zigzag rows of cations lying between layers of anions.
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing 211189,  People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Jin