Colorimetric and Fluorescent Signaling of Au3+ by Desulfurization of Thiocoumarin

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Abstract
We investigated the chemosignaling of Au3+ by the selective desulfurization of thiocoumarin. In the presence of a heavy metal ion chelator N,N,N′,N′-tetrakis-(2-pyridylmethyl)ethylenediamine, thiocoumarin was selectively converted to its oxo analogue by reaction with Au3+, resulting in a pronounced chromogenic and fluorescent signaling. Selective signaling of Au3+ was possible in the presence of common alkali, alkaline earth, and transition metal ions, as well as Au+ in a mixed aqueous environment. The colorimetric determination of Au3+ was possible by the color change from pink to yellowish green of the designed probe. The detection limit for the determination of Au3+ in 50% aqueous acetonitrile was 1.1 × 10–7 M.

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