Crystal structure, Hirshfeld surface analysis and DFT studies of (E)-4-methyl-2-{[(4-methyl­phen­yl)imino]­meth­yl}phenol

In the title compound, C(15)H(15)NO, the configuration of the C=N bond of the Schiff base is E, and an intra­molecular O—H⋯N hydrogen bond is observed, forming an intra­molecular S(6) ring motif. The phenol ring is inclined by 45.73 (2)° from the plane of the aniline ring. In the crystal, mol­ecules are linked along the b axis by O—H⋯N and C—H⋯O hydrogen bonds, forming polymeric chains. The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the packing arrangement are from H⋯H (56.9%) and H⋯C/C⋯H (31.2%) inter­actions. The density functional theory (DFT) optimized structure at the B3LYP/ 6–311 G(d,p) level is compared with the experimentally determined mol­ecular structure, and the HOMO–LUMO energy gap is provided. The crystal studied was refined as an inversion twin.