A highly selective fluorescent sensor for Hg~(2+) based on the water-soluble poly(p-phenyleneethynylene)

摘要

The conjugated polymer P-1 could be synthesized by the polymerization of 4,7-diethynyl-benzo[2,1,3]thiadiazole (M-1) and 1,4-bis[3'-(N,N-diethylamino)-1'-oxapropyl]-2,5-diiodobenzene (M-2) via Pd-catalyzed Sonogashira reaction. The water-soluble conjugated polyelectrolyte P-2 could be obtained by the reaction of P-1 with ethyl bromide. Both P-1 and P-2 can emit orange fluorescence. The responsive optical properties of P-1 and P-2 on Hg~(2+) were investigated by fluorescence spectra. Hg~(2+) can lead to nearly complete fluorescence quenching of P-1. On the contrary, Hg~(2+) can show the most pronounced fluorescence enhancement response of P-2 in aqueous solution without interference from those coexistent ions, such as K~+, Mg~(2+), Pb~(2+), Co~(2+), Ni~(2+), Ag~+, Cd~(2+), Cu~(2+), Fe~(3+) and Zn~(2+). The results also exhibit that this kind of water-soluble conjugated polyelectrolyte can be used as a highly sensitive and selective fluorescence sensor for Hg~(2+) detection in water.