Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/60975
Title: A smart "off-on" gate for the in situ detection of hydrogen sulphide with cu(ii)-assisted europium emission
Authors: Liang, Z
Tsoi, TH
Chan, CF
Dai, L
Wu, Y
Du, G
Zhu, L
Lee, CS
Wong, WT 
Law, GL 
Wong, KL
Issue Date: 2016
Source: Chemical science, 2016, v. 7, no. 3, p. 2151-2156
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.
Publisher: Royal Society of Chemistry
Journal: Chemical science 
ISSN: 2041-6520 (print)
2041-6539 (online)
DOI: 10.1039/c5sc04091d
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