title: 5-(2-Chlorophenyldiazenyl)salicylaldehyde 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(13)H(9)ClN(2)O(2), (I), is nearly planar, with an intramolecular O...O hydrogen bond of 2.692 (2) A. The latter title compound, C(17)H(18)ClN(3)O(4), (II), exists in the keto-amine tautomeric form, with a strong intramolecular hydrogen bond of 2.640 (2) A 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).
authors.affiliation: Department of Chemistry, Ondokuz Mayis University, TR-55139, Samsun, Turkey.
authors.forename: Cigdem
authors.initials: C
authors.lastname: Albayrak
authors.forename: Mustafa
authors.initials: M
authors.lastname: Odabaşoğlu
authors.forename: Orhan
authors.initials: O
authors.lastname: Büyükgüngör
authors.forename: Peter
authors.initials: P
authors.lastname: Lönnecke