Synthesis and Fluorescence of (E)-3-Aryl-2-(5-aryl-4H-1,2,4-triazol-3-yl) Acrylonitriles

Herein we report the synthesis of (E)-3-aryl-2-(5-aryl-4H-1,2,4-triazol-3-yl)acrylonitriles 3 a-k whose fluorescence properties have been investigated for the first time. A plausible reaction mechanism has been proposed to explain the total observed stereospecific formation of the E-isomers of compounds 3 a-k. The fluorescence analysis of compounds 3a-f has revealed relatively low values of the fluorescence emission quantum yields in a range of similar to 1 to 10 %, depending in the nature of the substituents.