5-(2-Chlorophenyldiazenyl)Salicyl-Aldehyde and 4-(2-Chlorophenyldiazenyl)-2-{[Tris(Hydroxymethyl)-Methyl]Aminomethylene}Cyclohexa-3,5-Dien-1(2H)-One

Abstract

The molecule of the former title compound, C<inf>13</inf>H <inf>9</inf>ClN<inf>2</inf>O<inf>2</inf>, (I), is nearly planar, with an intramolecular O⋯O hydrogen bond of 2.692 (2) Å. The latter title compound, C<inf>17</inf>H<inf>18</inf>ClN<inf>3</inf>O<inf>4</inf>, (II), exists in the keto-amine tautomeric form, with a strong intramolecular hydrogen bond of 2.640 (2) Å 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)° in (I) and 9.9 (1)° in (II). The N -H⋯O hydrogen-bonded rings are almost planar and coupled with the cyclohexadiene rings in (II).