A ‘turn-on’ fluorescent sensor for the selective detection of cobalt and nickel ions in aqueous media

Two newly designed turn-on fluorescein-based chemosensors are highly sensitive and selective for Co 2+ and Ni 2+ in both absorption and emission modes, normally difficult to achieve with these paramagnetic ions. Binding to both ions is reversible, as indicated by the bleaching of the color when the...

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Bibliographic Details
Published in:Tetrahedron letters 2011-10, Vol.52 (43), p.5554-5558
Main Authors: Abebe, Fasil A., Eribal, Carla Sue, Ramakrishna, Guda, Sinn, Ekkehard
Format: Article
Language:English
Subjects:
Analytical chemistry
Binding
Bleaching
Chemistry
Chemoreceptors
Chemosensor
Cobalt
Color
Emission
Exact sciences and technology
Fluorescein
Fluorescence
General, instrumentation
Heterocyclic compounds
Heterocyclic compounds with o, s, se, te hetero atom and condensed derivatives
Metal-detector
Nickel
Organic chemistry
Preparations and properties
Sensors
Synthesis
Turn-on
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Summary:Two newly designed turn-on fluorescein-based chemosensors are highly sensitive and selective for Co 2+ and Ni 2+ in both absorption and emission modes, normally difficult to achieve with these paramagnetic ions. Binding to both ions is reversible, as indicated by the bleaching of the color when the metal is extracted with EDTA. Given the difficulty of designing enhanced fluorescent sensors for paramagnetic Co 2+ and Ni 2+ ions, the fluorescein compounds may inspire the further development of more sophisticated sensing constructs for the detection of these ions.
ISSN:0040-4039
1873-3581
DOI:10.1016/j.tetlet.2011.08.072