Abstract
A highly selective and sensitive fluorescent ‘turn-on’ and chromogenic chemodosimeter based on tetrahydro[5]helicene thioimide has been developed. The chemodosimeter showed not only 200-fold enhancement of the fluorescent intensity in aqueous acetonitrile, but also marked color change of the solution from maroon to yellow-green solution upon the addition of Hg2+ ion. The detection limit of the chemodosimeter for Hg2+ was estimated to be 5.0×10−7M. The response mechanism was resulted from the Hg2+-induced desulfurization of the thioimide to its imide precursor.
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