title: A reversible fluorescence "off-on-off" sensor for sequential detection of aluminum and acetate/fluoride ions.
abstract: A new rhodamine functionalized fluorogenic Schiff base CS was synthesized and its colorimetric and fluorescence responses toward various metal ions were explored. The sensor exhibited highly selective and sensitive colorimetric and "off-on" fluorescence response towards Al(3+) in the presence of other competing metal ions. These spectral changes are large enough in the visible region of the spectrum and thus enable naked-eye detection. Studies proved that the formation of CS-Al(3+) complex is fully reversible and can sense to AcO(-)/F(-) via dissociation. The results revealed that the sensor provides fluorescence "off-on-off" strategy for the sequential detection of Al(3+) and AcO(-)/F(-).
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India; Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia; Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa. Electronic address: vinodfcy@iitr.ac.in.
authors.forename: Vinod Kumar
authors.initials: VK
authors.lastname: Gupta
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
authors.forename: Naveen
authors.initials: N
authors.lastname: Mergu
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
authors.forename: Lokesh Kumar
authors.initials: LK
authors.lastname: Kumawat
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
authors.forename: Ashok Kumar
authors.initials: AK
authors.lastname: Singh
mesh_terms: D000085:Acetates / Q000032:analysis* / Q000737:chemistry; D000535:Aluminum / Q000032:analysis* / Q000737:chemistry; D001667:Binding, Competitive; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003124:Colorimetry; D005456:Fluorescent Dyes / Q000737:chemistry; D005459:Fluorides / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008958:Models, Molecular; D008968:Molecular Conformation; D010209:Paper; D012235:Rhodamines / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D000085:Acetates; D005456:Fluorescent Dyes; D012235:Rhodamines; D012545:Schiff Bases; D000535:Aluminum; C029773:rhodamine B; D005459:Fluorides
keywords: Anion; Chemosensor; Fluorescence; Metal ion; Reversibility; Sequential detection