title: (E)-4-[(2-Hydroxy-benzyl-idene)amino]benzene-sulfonic acid.
abstract: The title mol-ecule, C(13)H(11)NO(4)S, displays a trans configuration with respect to the imine C=N double bond. The central benzene ring directly linked to N and the hydroxyl group are disordered over two orientations [occupancies of 0.510 (16)/0.490 (16) and 0.528 (8)/0.472 (8), respectively]. The dihedral angle between the two aromatic rings is 23.3 (5)° for the major component and 18.3 (5)° for the minor component. There is an intra-molecular O-H⋯N hydrogen bond and mol-ecules are linked into chains along the a axis by O-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, Baoji University of Arts and Science, Baoji, Shaanxi 721007, People's Republic of China.
authors.forename: Xinli
authors.initials: X
authors.lastname: Zhang
authors.forename: Zongxiao
authors.initials: Z
authors.lastname: Li