Experimental

R factor = 0.064; wR factor = 0.164; data-to-parameter ratio = 18.4. The title Schiff base, C19H24N2O3, exists in the crystal structure in the phenol–imine tautomeric form with an intramolecular O—H N hydrogen bond. The planes of the aromatic rings form a dihedral angle of 36.8 (8). The crystal packing is characterized by C—H O hydrogen bonds and – stacking interactions [centroid–centroid distance = 3.478 (4)Å]. Related literature Schiff bases of salicylaldehyde may exhibit thermochromism or photochromism, depending on the planarity or non