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 × 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 language | English |
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Pages (from-to) | 2151-2156 |
Number of pages | 6 |
Journal | Chemical Science |
Volume | 7 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Mar 2016 |
ASJC Scopus subject areas
- General Chemistry