title: 2-Carb-oxy-1-(3-nitro-phen-yl)ethanaminium perchlorate.
abstract: In the cation of the title compound, C(9)H(11)N(2)O(4) (+)·ClO(4) (-), the conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond. In the crystal packing, centrosymmetrically related cations inter-act through inter-molecular O-H⋯O hydrogen bonds involving the carb-oxy groups, forming dimers. The dimers and the perchlorate anions are further linked into layers parallel to the ab plane by C-H⋯O and N-H⋯O hydrogen-bonding inter-actions.
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical, Engineering, Southeast University, Nanjing 210096, People's Republic of China.
authors.forename: Wen-Xian
authors.initials: WX
authors.lastname: Liang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.forename: Zhi-Rong
authors.initials: ZR
authors.lastname: Qu