2-Carboxy­anilinium bromide monohydrate

The title compound, C(7)H(8)NO(2) (+)·Br(−)·H(2)O, is isomorphous with 2-carboxy­anilinium chloride monohydrate and contains an intra­molecular N—H⋯O hydrogen bond, forming an S(6) motif. The main inter­molecular inter­actions 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 mol­ecule, 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 inter­sect, 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. Hydro­philic layers are generated at z = 0 and 1/2 which are sandwiched between alternate hydro­phobic layers across z = 1/4 and 3/4.