title: A squaraine-based colorimetric and "turn on" fluorescent sensor for selective detection of Hg2+ in an aqueous medium.
abstract: A novel squaraine-based chemosensor SQ-1 has been synthesized, and its sensing behavior toward various metal ions was investigated by UV-vis and fluorescence spectroscopies. In AcOH-H(2)O (40:60, v/v) solution, Hg(2+) ions coordinate with SQ-1 causing a deaggregation which induces a visual color and absorption spectral changes as well as strong fluorescence. In contrast, the addition of other metals (e.g., Pb(2+), Cd(2+), Cu(2+), Zn(2+), Al(3+), Ni(2+), Co(2+), Fe(3+), Ca(2+), K(+), Mg(2+), Na(+), and Ag(+)) does not induce these changes at all. Thus SQ-1 is a specific Hg(2+) sensing agent due to the inducing deaggregation of the dye molecule by Hg(2+).
authors.affiliation: Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education & Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fuzhou University, Fuzhou, P R China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Chen
authors.forename: Ruyong
authors.initials: R
authors.lastname: Wang
authors.forename: Liangqia
authors.initials: L
authors.lastname: Guo
authors.forename: Nanyan
authors.initials: N
authors.lastname: Fu
authors.forename: Haijun
authors.initials: H
authors.lastname: Dong
authors.forename: Yaofeng
authors.initials: Y
authors.lastname: Yuan
mesh_terms: D003124:Colorimetry / Q000379:methods; D003503:Cyclobutanes; D005456:Fluorescent Dyes; D007477:Ions; D008628:Mercury / Q000032:analysis*; D008670:Metals / Q000032:analysis; D010636:Phenols; D014867:Water
chemical_list: D003503:Cyclobutanes; D005456:Fluorescent Dyes; D007477:Ions; D008670:Metals; D010636:Phenols; C480596:squaraine; D014867:Water; D008628:Mercury