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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

49 Citations (Scopus)


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 × 105M-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 × 104M-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
Issue number3
Publication statusPublished - 1 Mar 2016

ASJC Scopus subject areas

  • Chemistry(all)

Cite this