Selectively fluorescent sensing behavior of phenylaza-15-crown-5-triazolyl coumarin for Hg2+ and Fe3+ in alcohol and aqueous media respectively

Abstract

A π-conjugated phenylaza-15-crown-5-triazol-substituted coumarin fluoroionophore 1 was synthesized by copper(I)-catalyzed Huisgen alkyne-azide 1,3-dipolar cycloaddition (CuAAC click reaction). 1 can display selective fluorescence enhancement toward Fe3+ over Hg2+, Cr 3+ and the other metal ions in aqueous solution. In sharp contrast, the fluorescence behavior between Fe3+ and Hg2+ is completely reversed in EtOH. That is, Hg2+ gives the largest fluorescence enhancement over Cr3+, Fe3+ and the other metal ions. A π-conjugated phenylaza-15-crown-5-triazol-substituted coumarin fluoroionophore 1 was synthesized. 1 can display selective fluorescence enhancement toward Fe3+ over Hg2+, Cr3+ and the other metal ions in aqueous solution. In sharp contrast, Hg2+ gives the largest fluorescence enhancement over Cr3+, Fe3+ and the other metal ions in EtOH. Copyright © 2013 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.