| 摘 要： | 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 tetradentateβ-diketone 1,2-bis[4'-(1",1",1",2",2"-pentafluoro-3",5"-pentanedion-5"-yl)benzyl]-4-chlorosulfo-benzene(BPPBCB),a novel dual-functional ligand that can coordinate to Eu~(3+)for responding to Cu~(2+)and S~2 ions in aqueous media,DPA-BPPBCB,has been designed and synthesized.Theβ-diketone moiety of DPA-BPPBCB can form a strongly luminescent complex with Eu~(3+).Upon reaction with Cu~(2+),accompanied by the formation of heterobimetallic complex Cu~(2+)-DPA-BPPBCB-Eu~(3+),the Eu~(3+)luminescence was quenched.While in the presence of S~2,owing to the high affinity of S~2 to Cu~(2+),stable CuS was formed,which resulted in the release of Cu~(2+)from Cu~(2+)-DPA-BPPBCB-Eu~(3+),to restore the luminescence of the Eu~(3+)complex.This unique"on-off-on"luminescence response of the Eu3+complex enabled Cu~(2+)and S~2 ions in aqueous media to be detected with time-resolved luminescence detection mode.
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