Hg~(2+)-Selective Chemosensor Derived from 8-Hydroxyquinoline Having Benzothiazole Function in Aqueous Environment

摘要

Newly synthesized 8-hydroxyquinoline based benzothiazole derivative 2 showed a distinctive Hg~(2+)-selectivity over other transition metal ions in aqueous solution.The fluorescence emission at 455 nm of 2 was completely quenched upon interaction with Hg~(2+) ions in dioxane-H_2O system (9 :1,v/v).The selectivity was decreased in the order of Hg2+ " Cu~(2+)>Cd~(2+)>Pb~(2+) approx =Zn~(2+) approx= Ni~(2+),and Hg~(2+) concentration dependent fluorescence quenching profile was observed in the presence of common interfering metal ions as background.The fluorescence behavior of 2 suggests that the prepared compound could be used as a fluorescent signaling subunit for the construction of new Hg~(2+)-sensitive ON-OFF type supramolecular switching systems.