Two Ketimine Polymorphs of 2-{1-[(2-Aminophenyl)imino]ethyl}phenol

Two polymorphic structures of the Schiff base 2-{1-[(2-aminophenyl)imino]ethyl}phenol, compound (1), C14H14N2O are reported. Depending on the solvent used for recrystallization it crystallizes as either a monoclinic or an orthorhombic polymorph. The monoclinic form, polymorph [1] contains three, while the orthorhombic polymorph [2] contains only one molecule in the asymmetric unit. In both polymorphs, a strong intramolecular O–H•••N hydrogen bond is present from the stereochemical reason due to the rigidity of the chelate ring. Weak intermolecular N–H•••O interactions appearing in both structures combine the molecules in the form of infinite columns by the graph-set motif C2 2(7).