Hg2+-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 Hg2+-selectivity over other transition metal ions in aqueous solution. The fluorescence emission at 455 nm of 2 was completely quenched upon interaction with Hg2+ ions in dioxane-H2O system (9 : 1, v/v). The selectivity was decreased in the order of Hg2+ Cu2+ > Cd2+ > Pb2+ ? Zn2+ ? Ni2+, and Hg2+ 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 Hg2+-sensitive ON-OFF type supramolecular switching systems.