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‐4 H ‐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 ∼1 to 10 %, depending in the nature of the substituents.