title: (S)-2-(1-Hydroxy-ethyl)benzimid-azolium dihydrogen phosphate.
abstract: The asymmetric unit of the title compound, C(9)H(11)N(2)O(+)·H(2)PO(4) (-), is built up from a 2-(1-hydroxy-ethyl)benz-imid-a-zol-ium cation and a dihydrogen phosphate anion which are connected by an N-H⋯O hydrogen bond. The cation is roughly planar, the dihedral angle between the rings being only 1.4 (2)°. The S configuration is deduced from the synthetic pathway and supported by the refinement of the Flack parameter. Inter-molecular O-H⋯O and N-H⋯O hydrogen bonds build up a three-dimensionnal network.
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, People's Republic of China.
authors.forename: Rong
authors.initials: R
authors.lastname: Xia