title: 1H-Benzotriazol-1-yl 4-{(E)-[4-(dimethyl-amino)-phen-yl]diazen-yl}benzoate.
abstract: The title compound, C(21)H(18)N(6)O(2), was obtained as a by-product of a reaction between (E)-4-(4-dimethyl-amino-phenyl-azo)benzoic acid and 2-amino-4-(2-pyrid-yl)-6-(6-pyrid-yl)-1,3,5-triazine, which has a very low solubility, under peptidic coupling conditions, using THF as solvent. The condensation reaction occurred between 1-hy-droxy-benzotriazole and (E)-4-(4-dimethyl-amino-phenyl-azo)benzoic acid. The dihedral angle between the benzene rings in the (E)-diphenyl-diazene fragment is 10.92 (13)° and that between the benzotriazole mean plane and the central benzene ring is 80.57 (7)°. In the crystal, π-π stacking [centroid-centroid distances = 3.823 (2) and 3.863 (2) Å] of similar fragments generates mol-ecular layers parallel to (0-12). The crystal packing also features weak C-H⋯N hydrogen bonds involving N atoms of the benzotriazole ring.
authors: LUNAM Université, Université d'Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, CNRS-UMR 6200, 2 bd. Lavoisier, 49045 Angers,  France.
authors: Abdelkrim
authors: A
authors: El-Ghayoury
authors: Leokadiya
authors: L
authors: Zorina
authors: Mostafa
authors: M
authors: Khouili