5-(2-chlorophenyidiazenyl)salicyl-aidehyde and 4-(2-chlorophenyldiazenyl)-2-{[tris(hydroxymethyl)- methyl]aminomethylene}cyclohexa-3,5-dien-1(2H)-one

Abstract

The molecule of the former title compound, C13H9ClN2O2, (I), is nearly planar, with an intramolecular O...O hydrogen bond of 2.692 (2) Angstrom. The latter title compound, C17H18ClN3O4, (II), exists in the keto - amine tautomeric form, with a strong intramolecular hydrogen bond of 2.640 (2) Angstrom between the O and N atoms, the H atom being bonded to the N atom. The azobenzene moieties of both molecules have trans configurations, and the dihedral angle between the planes of the two aromatic rings is 4.1 (1)degrees in (I) and 9.9 (1)degrees in (II). The N-H...O hydrogen-bonded rings are almost planar and coupled with the cyclohexadiene rings in (II).