2-Carboxyanilinium bromide monohydrate

Abstract

The title compound, C7H8NO2+·Br-·H2O, is isomorphous with 2-carboxy-anilinium chloride monohydrate and contains an intra-molecular N - H⋯O hydrogen bond, forming an S(6) motif. The main inter-molecular inter-actions are of the N - H⋯O/Br and O - H⋯O/Br types. Hydrogen-bonding dimers are formed via the carboxyl groups and the uncoordinated water mol-ecule, with centrosymmetric R 4 4(12) ring motifs, in tandem with centrosymmetric R 8 4(16) ring motifs formed by the cations and bromide anions. The hydrogen-bonded ring motifs inter-sect, forming chains with graph-set motif C 4 3(10) extending along the a axis. These form a two-dimensional hydrogen-bonded network in (101) which is extended along [010] through N - H⋯Br hydrogen bonds. Hydro-philic layers are generated at z = 0 and 1/2 which are sandwiched between alternate hydro-phobic layers across z = 1/4 and 3/4.