Fluorescence Polymer Incorporating Triazole and Benzo[2,1,3]thiadiazole Moieties for Ni2+ Detection

Conjugated polymer could be obtained by the polymerization of 4,7-diethynylbenzo[2,1,3]thiadiazole (M-1) with 1,4-diazidobenzene (M-2) via click reaction. The polymer shows strong blue-green fluorescence due to the extended pi-electronic structure in the main chain backbone. The responsive optical properties of the polymer on various transition metal ions were investigated by fluorescence spectroscopy. Compared with other transition metal cations, such as Co2+, Hg2+, Ag+, Cd2+, Cu2+ and Zn2+, Ni2+ showed the most pronounced fluorescence response in the presence of the conjugated polymer. The results indicate this kind of polymer with benzo[2,1,3]thiadiazole and triazole units can be used as a selective fluorescence sensor for Ni2+ detection.