A smart "off–on" gate for the in situ detection of hydrogen sulphide with Cu(ii)-assisted europium emission. Issue 3 (7th January 2016)

• Record Type: Journal Article
• Authors: Liang, Zhenhao; Tsoi, Tik-Hung; Chan, Chi-Fai; Dai, Lixiong; Wu, Yudan; Du, Guangyan; Zhu, Lizhi; Lee, Chi-Sing; Wong, Wing-Tak; Law, Ga-Lai; Wong, Ka-Leung
• Is Part Of: Chemical science. Volume 7:Issue 3(2016:Mar.)
• Page Start: 2151
• Page End: 2156
• Publication Date: 2016-01-07
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5sc04091d
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A novel responsive europium-based luminescence "off–on" gate for the in situ detection of H2 S in water was developed. Abstract : A water-soluble and emissive Eu-complex (EuL1 ) bearing a DO3A(Eu 3+ )–pyridine–aza-crown motif has been prepared and its Cu 2+ complex has been demonstrated to be a smart luminescence "off–on" gate for H2 S detection in water with a nano-molar detection limit (60 nM).EuL1 binds to Cu 2+ ions selectively ( K B = 1.2 × 10 5 M −1 ) inducing 17-fold luminescence quenching and forming a 1 : 1 stoichiometric complex (EuL1 –Cu 2+ ), which responds to H2 S selectively with restoration of the original Eu emission ofEuL1 followed by a further 40-fold luminescence enhancement, forming a 1 : 1 stoichiometric complex (EuL1 –Na2 S, K B = 1.5 × 10 4 M −1 ). Without Cu 2+ ions, EuL1 showed non-specific binding towards H2 S with only a 5-fold luminescence enhancement.