Two newly designed turn-on fluorescein-based chemosensors are highly sensitive and selective for Co2+ and Ni2+ 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 Co2+ and Ni2+ ions, the fluorescein compounds may inspire the further development of more sophisticated sensing constructs for the detection of these ions.Two new fluorescein-based chemosensors for Cu2+ were designed with highly selective �off-on� behavior, one of them working in both absorption and emission, the other only in emission. Binding to Cu2+ binding is reversible, as indicated by the bleaching of the color when the metal is extracted. The compounds are the basis for rapid, selective and sensitive Cu2+ chemosensors in aqueous media.

“Turn-On” fluorescent sensor for the selective detection of cobalt, nickel and copper ions in aqueous media

243rd National Meeting (2012)

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