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Indexed by:Journal Papers

Date of Publication:2015-12-01

Journal:CHINESE CHEMICAL LETTERS

Included Journals:SCIE、ISTIC、CSCD、Scopus

Volume:26

Issue:12

Page Number:1485-1489

ISSN No.:1001-8417

Key Words:Europium complex; Luminescent probe; Copper(II) ion; Sulfide ion; Time-resolved luminescence detection

Abstract:Lanthanide complex-based luminescent probes/chemosensors have shown great utilities in various biological and environmental assays with time-resolved detection mode to eliminate background noises. In this work, by conjugating di(2-picolyl)amine (DPA) with a tetradentate beta-diketone 1,2-bis[4'-(1 '',1 '',1 '',2 '',2 ''-pentafluoro-3 '',5 ''-pentanedion-5 ''-yl)benzy1]-4-chlorosulfo-benzene (BPPBCB), a novel dual-functional ligand that can coordinate to Eu3+ for responding to Cu2+ and S2- ions in aqueous media, DPA-BPPBCB, has been designed and synthesized. The beta-diketone moiety of DPA-BPPBCB can form a strongly luminescent complex With Eu3+. Upon reaction with Cu2+, accompanied by the formation of heterobimetallic complex Cu2+-DPA-BPPBCB-Eu3+, the Eu3+ luminescence was quenched. While in the presence of S2-, owing to the high affinity of S2- to Cu2+, stable CuS was formed, which resulted in the release of Cu2+ from Cu2+-DPA-BPPBCB-Eu3+, to restore the luminescence of the Eu3+ complex. This unique "on-off-on" luminescence response of the Eu3+ complex enabled Cu2+ and S2- ions in aqueous media to be detected with time-resolved luminescence detection mode. (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.