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Indexed by:期刊论文

Date of Publication:2017-07-07

Journal:NEW JOURNAL OF CHEMISTRY

Included Journals:SCIE、Scopus

Volume:41

Issue:13

Page Number:5981-5987

ISSN No.:1144-0546

Abstract:We have developed a novel beta-diketonate-europium(III) complex-based fluorescent probe, Eu3+-BHHCT-BPED, by introducing Cu2+-binding dipicolylamine (DPA)-containing N, N-bis(2-pyridylmethyl) ethanediamine (BPED) into a tetradentate beta-diketone ligand 4,4'-bis(1 '',1 '',1 '',2 '',2 '',3 '',3 ''-heptafluoro-4 '',6 ''-hexanedione-6 ''-yl) chlorosulfo-o-terphenyl (BHHCT). The probe was strongly fluorescent with a high quantum yield (57.6%) and a long luminescence lifetime (0.81 ms). Upon addition of Cu2+ ions, the fluorescence emission of Eu3+-BHHCT-BPED at 607 nm was selectively and efficiently quenched due to the coordination of Cu2+ ions with the BPED moiety. Furthermore, the resulting heterobimetallic complex Eu3+-BHHCT-BPED-Cu2+ displayed specific luminescence response to sulfide ions because a reversible fluorescence revival was induced by the formation of CuS. The "on-off-on'' type signaling behavior of Eu3+-BHHCT-BPED towards Cu2+ and sulfide ions enabled the sensing of the two species with the detection limits of 3.7 nM and 0.19 mu M, respectively. The time-gated luminescence imaging study has demonstrated the applicability of Eu3+-BHHCT-BPED for monitoring intracellular Cu2+ and sulfide ions with high sensitivity and selectivity.