Dual-mode unsymmetrical squaraine-based sensor for selective detection of Hg2+ in aqueous media.
A novel chemosensor based on unsymmetrical squaraine dye (USQ-1) for the selective detection of Hg(2+) in aqueous media is described. USQ-1 in combination with metal ions shows dual chromogenic and "turn-on" fluorogenic response selectivity toward Hg(2+) as compared to Li(+), Na(+), K(+), Mg(2+), Ca(2+), Ba(2+), Al(3+), Cu(2+), Cd(2+), Mn(2+), Fe(3+), Ag(+), Pb(2+), Zn(2+), Ni(2+) and Co(2+) due to the Hg(2+)-induced deaggregation of the dye molecule. A recognition mechanism based on the binding mode is proposed based on the absorption and fluorescence changes, (1)H NMR titration experiments, ESI-MS study, and theoretical calculations.
Key Laboratory of Analysis and Detection for Food Safety, Ministry of Education, Department of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China.
Cheng
C
Chen
Haijun
H
Dong
Yaqing
Y
Chen
Liangqia
L
Guo
Zhenyu
Z
Wang
Jian-Jun
JJ
Sun
Nanyan
N
Fu
D002413:Cations, Divalent / Q000737:chemistry; D003503:Cyclobutanes / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*
D002413:Cations, Divalent; D003503:Cyclobutanes; D010636:Phenols; C480596:squaraine; D008628:Mercury