title: Recognition of Mg²⁺ by a new fluorescent "turn-on" chemosensor based on pyridyl-hydrazono-coumarin.
abstract: A new fluoroionophore PyHC bearing 2-pyridylhydrazone and 7-hydroxycoumarin moieties for selective detection of Mg(2+) was synthesized and characterized. This chemosensor exhibited "turn-on" fluorescence behavior and was sensitive to Mg(2+) concentrations as low as 105 nmol L(-1) in ethanol-water solution. Detailed spectroscopic studies revealed the binding mode of a 1:1 complex between PyHC and Mg(2+) that leads to a fluorescence enhancement.
authors.affiliation: Bioorganic Compounds Research Group, Department of Chemistry, Universidad de los Andes, Carrera 1 No. 18A 10, Bogotá, Colombia.
authors.forename: Jessica
authors.initials: J
authors.lastname: Orrego-Hernández
authors.affiliation: Bioorganic Compounds Research Group, Department of Chemistry, Universidad de los Andes, Carrera 1 No. 18A 10, Bogotá, Colombia.
authors.forename: Nelson
authors.initials: N
authors.lastname: Nuñez-Dallos
authors.affiliation: Bioorganic Compounds Research Group, Department of Chemistry, Universidad de los Andes, Carrera 1 No. 18A 10, Bogotá, Colombia. Electronic address: jportill@uniandes.edu.co.
authors.forename: Jaime
authors.initials: J
authors.lastname: Portilla
mesh_terms: D003374:Coumarins / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry*; D006835:Hydrazones / Q000737:chemistry*; D057230:Limit of Detection; D008274:Magnesium / Q000032:analysis* / Q000737:chemistry*; D012545:Schiff Bases / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: C000612643:7-hydroxy-4-methyl-8-((2-(pyridin-2-yl)hydrazono)methyl)-2H-chromen-2-one; D003374:Coumarins; D005456:Fluorescent Dyes; D006835:Hydrazones; D012545:Schiff Bases; D014867:Water; D000431:Ethanol; D008274:Magnesium
keywords: Chemosensor; Fluorescence; Mg(2+); Pyridyl-hydrazono-coumarin; Schiff base