4-{(E)-2-[4-(But-3-en-1-yloxy)phenyl]-diazen-1-yl}benzoic acid

Abstract

The title compound, C17H16N2O3, has an E conformation about the azobenzene (-N=N-) linkage. The benzene rings are twisted slightly with respect to each other [6.79 (9)°], while the dihedral angle between the plane through the carboxy group and the attached benzene ring is 3.2 (2)°. In the crystal, molecules are oriented with the carboxy groups head-to-head, forming O - H···O hydrogen-bonded inversion dimers. These dimers are connected by C - H···O hydrogen-bonds into layers lying parallel to the (013) plane.