A smart "off-on" gate for the in situ detection of hydrogen sulphide with Cu(ii)-assisted europium emission

Zhenhao Liang, Tik Hung Tsoi, Chi Fai Chan, Lixiong Dai, Yudan Wu, Guangyan Du, Lizhi Zhu, Chi Sing LEE*, Wing Tak Wong, Ga Lai Law, Ka-Leung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

A water-soluble and emissive Eu-complex (EuL1) bearing a DO3A(Eu3+)-pyridine-aza-crown motif has been prepared and its Cu2+ complex has been demonstrated to be a smart luminescence "off-on" gate for H2S detection in water with a nano-molar detection limit (60 nM). EuL1 binds to Cu2+ ions selectively (KB = 1.2 × 105 M-1) inducing 17-fold luminescence quenching and forming a 1 : 1 stoichiometric complex (EuL1-Cu2+), which responds to H2S selectively with restoration of the original Eu emission of EuL1 followed by a further 40-fold luminescence enhancement, forming a 1 : 1 stoichiometric complex (EuL1-Na2S, KB = 1.5 × 104 M-1). Without Cu2+ ions, EuL1 showed non-specific binding towards H2S with only a 5-fold luminescence enhancement.

Original languageEnglish
Pages (from-to)2151-2156
Number of pages6
JournalChemical Science
Volume7
Issue number3
DOIs
Publication statusPublished - 1 Mar 2016

Scopus Subject Areas

  • Chemistry(all)

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