A combinatorial chemistry approach to new materials for non-linear optics.II. 4-(Dimethylamino)cinnamaldehyde and a molecular complex of 4-methoxycinnamaldehyde with 2,4-dinitroaniline

The combinatorial chemistry approach has been used to synthesize an array o f Schiff bases. The structures of five of these Schiff bases have been conf irmed by X-ray analysis [Nesterov, Timofeeva, Borbulevych, Antipin & Clark (2000). Acta Cryst. C56, 971-975]. In two cases, the reaction conditions we re not sufficient to obtain the products in question. In one case, a molecu lar complex, C10H10O2.-C6H5N3O4, of the starting products 4-methoxycinnamal dehyde and 2,4-dinitroaniline was found. X-ray analysis revealed hydrogen-b ond formation between the molecules of these reagents in the crystal. In th e other case, X-ray analysis demonstrated that no chemical reaction occurre d under the reaction conditions, and only one starting reagent, 4-(dimethyl amino)cinnamaldehyde, C11H13NO, was found in the precipitate.