| Summary: | The title compound, C13H10BrNO2, crystallizes in a zwitterionic form. The zwitterion exists in a trans configuration about the C=N bond and is almost planar, the dihedral angle between the two benzene rings being 2.29 (9)°. An intramolecular N—H...O hydrogen bond formed between the iminium NH+ and the phenolate O− atoms generates an S(6) ring motif. In the crystal, the zwitterions are linked through O—H...O hydrogen bonds into chains along [101] and these chains are further connected through C—H...Br interactions into a two-dimensional network perpendicular to (101). C...C [3.572 (3)–3.592 (3) Å] and C...Br [3.5633 (19)–3.7339 (18) Å] short contacts are observed. The crystal studied was a twin with twin law overline{1}00, 0overline{1}0, 001 with a domain ratio of 0.09919 (2):0.90081 (2).
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