A highly selective redox, chromogenic, and fluorescent chemosensor for Hg2+ in aqueous solution based on ferrocene–glycine bioconjugates

Thakur, Arunabha ; Sardar, Sinjinee ; Ghosh, Sundargopal (2011) A highly selective redox, chromogenic, and fluorescent chemosensor for Hg2+ in aqueous solution based on ferrocene–glycine bioconjugates Inorganic Chemistry, 50 (15). pp. 7066-7073. ISSN 0020-1669

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic200573m

Related URL: http://dx.doi.org/10.1021/ic200573m

Abstract

The synthesis, electrochemical, optical, and metal-cation-sensing properties of ferrocene–glycine conjugates C30H38O8N8Fe (2) and C20H24O4N4Fe (3) have been documented. Both compounds 2 and 3 behave as very selective redox (ΔE1/2 = 217 mV for 2 and ΔE1/2 = 160 mV for 3), chromogenic, and fluorescent chemosensors for Hg2+ cations in an aqueous environment. The considerable changes in their absorption spectra are accompanied by the appearance of a new low-energy peak at 630 nm (2, ε = 1600 M–1cm–1; 3, ε = 822 M–1cm–1). This is also accompanied by a strong color change from yellow to purple, which allows a prospective for the “naked eye” detection of Hg2+ cations. These chemosensors present immense brightness and fluorescence enhancement (chelation-enhanced fluorescence = 91 for 2 and 42 for 3) following Hg2+ coordination within the limit of detection for Hg2+ at 7.5 parts per billion.

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