Liu Ming-Liang
Ordered Matter Science Research Center, Southeast University, Nanjing 211189, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):o342. doi: 10.1107/S1600536812000049. Epub 2012 Jan 11.
The asymmetric unit of the title compound, C(8)H(6)F(3)N(2) (+)·0.5C(10)H(6)O(6)S(2) (2-), consists of one 2-trifluoro-methyl-1H-benz-imidazol-3-ium cation and a half naphthalene-1,5-disulfate anion, which are linked by an N-H⋯O hydrogen bond. The anion sits across a centre of symmetry. The atoms of the benzimidazole ring are nearly coplanar (r.m.s. deviation of the fitted atoms = 0.0085 Å) and the triflouromethyl group lies out of this plane. In the crystal, the cations are linked to adjacent anions by N-H⋯O hydrogen bonds, forming a ladder structure parallel to the a axis in which the anions form the rungs. Adjacent ladders are linked by weak C-H⋯O inter-actions, forming sheets parallel to the ac plane.
标题化合物C(8)H(6)F(3)N(2) (+)·0.5C(10)H(6)O(6)S(2) (2-)的不对称单元由一个2-三氟甲基-1H-苯并咪唑-3-鎓阳离子和半个萘-1,5-二硫酸根阴离子组成，它们通过N-H⋯O氢键相连。阴离子位于对称中心上。苯并咪唑环的原子几乎共面（拟合原子的均方根偏差 = 0.0085 Å），三氟甲基位于该平面之外。在晶体中，阳离子通过N-H⋯O氢键与相邻阴离子相连，形成平行于a轴的阶梯结构，其中阴离子形成梯级。相邻的阶梯通过弱C-H⋯O相互作用相连，形成平行于ac平面的片层。
