Synthesis of new 1,3,5-tris-styryl-benzene compounds with tunable photo- and electroluminescent properties

A new series of 1,3,5-tris-styryl-benzene compounds is obtained by Knoevena gel reaction of a 1,3,5-tris-cyanomethylene benzene derivative with three m olecules of a substituted benzaldehyde. The synthesis starting from mesityl ene, followed by bromomethylation or NBS-bromination, bromo-cyano exchange and a threefold condensation reaction leads to a conjugated system with dif ferent optical properties, depending on the substituent in the p-position ( alkyl, alkoxy, amino). The photo- and electroluminescent properties are inv estigated.