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, C(20)H(19)N(3)O(3), 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)° and to the 4-meth­oxy­phenyl ring by 4.73 (8)°. In the crystal, mol­ecules are linked by pairs of O—H⋯N hydrogen bonds, forming inversion dimers with an R (2) (2)(12) ring motif. The dimers are linked by O—H⋯O and C—H⋯O hydrogen bonds, forming layers parallel to the ac plane. There are C—H⋯π inter­actions present within the layers and between the layers, leading to the formation of a supra­molecular framework. The layers are also linked by offset π–π inter­actions, with an inter­planar distance of 3.416 (2) Å.