title: Turn-on fluorescent chemosensor for Hg²⁺ based on multivalent rhodamine ligands.
abstract: Rhodamine-based fluorescent chemosensors 1 and 2 exhibit selective fluorescence enhancement to Fe3+ and Hg2+ over other metal ions at 580 nm in CH(3)CN/H(2)O (3/1, v/v) solution. Bis(rhodamine) chemosensor 1, under optimized conditions (CH(3)CN/HEPES buffer (0.02 M, pH = 7.0) (95/5, v/v)), shows a high selectivity and sensitivity to Hg2+, with a linear working range of 0-50 μM, a wide pH span of 4-10, and a detection limit of 0.4 μM Hg2+.
authors.affiliation: Laboratory of Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands. w.verboom@utwente.nl.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Wang
authors.forename: Mudassir
authors.initials: M
authors.lastname: Iqbal
authors.forename: Jurriaan
authors.initials: J
authors.lastname: Huskens
authors.forename: Willem
authors.initials: W
authors.lastname: Verboom
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry; D020450:Heavy Ions; D008024:Ligands; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D012235:Rhodamines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D005290:Ferric Compounds; D005456:Fluorescent Dyes; D008024:Ligands; D012235:Rhodamines; D008628:Mercury