Crystal structure and Hirshfeld surface analysis of (E)-2-[1-hydroxy-2-(pyridin-2-yl)ethyl]-4-[2-(4-methoxyphenyl)diazen-1-yl]phenol

In the title compound, C20H19N3O3, the configuration about the azo N=N bond is E, and the central benzene ring is inclined to the pyridine ring by 31.43 (8)degrees and to the 4-methoxyphenyl ring by 4.73 (8)degrees. In the crystal, molecules are linked by pairs of O-H center dot center dot center dot N hydrogen bonds, forming inversion dimers with an R-2(2)(12) ring motif. The dimers are linked by O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds, forming layers parallel to the ac plane. There are C-H center dot center dot center dot pi interactions present within the layers and between the layers, leading to the formation of a supramolecular framework. The layers are alsolinked by offset pi-pi interactions, A with an interplanar distance of 3.416 (2) angstrom.