title: Dual-mode semisquaraine-based sensor for selective detection of Hg2+ in a micellar medium.
abstract: [reaction: see text] A novel chemosensor based on semisquaraine dye (SSQ) for selective detection of Hg2+ is described. SSQ is obtained in quantitative yields from the reaction between squaric acid and 6-ethoxy-2-quinaldinium iodide. SSQ in combination with surfactant shows a dual chromogenic and fluorogenic response selectively toward Hg2+ as compared to Li+, Na+, K+, Ag+, Ca2+, Mg2+, Zn2+, Pb2+, Cd2+, Cu2+, and Fe3+ due to the soft acid nature and size of the mercuric ion.
authors.affiliation: Photosciences and Photonics, Chemical Sciences & Technology Division, Regional Research Laboratory (CSIR), Trivandrum 695 019, India.
authors.forename: Rekha R
authors.initials: RR
authors.lastname: Avirah
authors.forename: Kuthanapillil
authors.initials: K
authors.lastname: Jyothish
authors.forename: Danaboyina
authors.initials: D
authors.lastname: Ramaiah
mesh_terms: D002413:Cations, Divalent / Q000737:chemistry; D003503:Cyclobutanes / Q000138:chemical synthesis / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D008823:Micelles; D008958:Models, Molecular; D015394:Molecular Structure; D010636:Phenols / Q000138:chemical synthesis / Q000737:chemistry*; D013057:Spectrum Analysis; D055672:Static Electricity
chemical_list: D002413:Cations, Divalent; D003503:Cyclobutanes; D008823:Micelles; D010636:Phenols; C480596:squaraine; D008628:Mercury