2-[( E)-(5- tert-Butyl-2-hydroxy­phen­yl)­diazen­yl]benzoic acid

Abstract

The title compound, C ₁₇H ₁₈N ₂O ₃, is approximately planar, owing in part to an intra­molecular bifurcated O—H⋯(N,O) hydrogen bond; the dihedral angle between the two aromatic rings is 23.86 (9)°. In the crystal struture, centrosymmetrically related mol­ecules associate into dimers via the eight-membered carboxyl­ate {⋯H—O—C=O} ₂ synthon.