title: "Naked-eye" colorimetric and "turn-on" fluorometric chemosensors for reversible Hg2+ detection.
abstract: Two new Hg(2+)-colorimetric and fluorescent sensors based on 2-[3-(2-aminoethylsulfanyl) propylsulfanyl]ethanamine covalently bound to one and two units of rhodamine-6G moieties, 1 and 2, were synthesised, and their sensing behaviors toward metal ions were investigated by UV/Vis and fluorescence spectroscopy. Upon the addition of Hg(2+), the sensors exhibited highly sensitive "turn-on" fluorescence enhancement as well as a color change from colorless to pink, which was readily noticeable for naked eye detection. Especially, 1 exhibited the reversible behavior and revealed a very high selectivity in the presence of competitive ions, particularly Cu(2+), Ag(+), Pb(2+), Ca(2+), Cd(2+), Co(2+), Fe(2+), Mn(2+), Na(+), Ni(2+), K(+), Ba(2+), Li(+) and Zn(2+), with a low detection limit of 1.7 ppb toward Hg(2+).
authors.affiliation: Department of Chemistry, Faculty of Science, Silpakorn University, Nakorn Pathom 73000, Thailand. Electronic address: nantanit@su.ac.th.
authors.forename: Nantanit
authors.initials: N
authors.lastname: Wanichacheva
authors.forename: Panida
authors.initials: P
authors.lastname: Praikaew
authors.forename: Thanapat
authors.initials: T
authors.lastname: Suwanich
authors.forename: Kanjarat
authors.initials: K
authors.lastname: Sukrat
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D003124:Colorimetry / Q000379:methods*; D005456:Fluorescent Dyes / Q000737:chemistry*; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D008958:Models, Molecular; D012235:Rhodamines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D012235:Rhodamines; C026188:rhodamine 6G; D008628:Mercury
keywords: Colorimetric change; Fluorescent turn-on; High-selectivity; High-sensitivity; Mercury sensor