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The title chiral photochromic Schiff base compound, C 21 H 19 N 3 O, was synthesized from ( R )-1-phenyl­ethyl­amine and the salicylaldehyde of an azobenzene derivative. The mol­ecule corresponds to the phenol–imine tautomer, the C=N and N—C bond distances being 1.279 (3) and 1.477 (3) Å, respectively. An intra­molecular O—H⋯N hydrogen bond occurs. The diazenyl group adopts a  trans  form with an N=N distance of 1.243 (3) Å.

4-Phenyldiazenyl-2-[(R)-(1-phenylethyl)iminomethyl]phenol