A “turn-on” coumarin-based fluorescent sensor with high selectivity for mercury ions in aqueous media

Abstract

The synthesis and spectral profile of a "turn-on" fluorescent sensor selective for Hg(2+) ions in aqueous media is described.

Lanthanide luminescence sensing of copper and mercury ions using an iminodiacetate-based Tb(III)-cyclen chemosensor

“…While many examples of luminescent lanthanide sensors of group I and II metal ions, as well as several transition metal ions such as Cu(II), Zn(II), etc. exist, [13][14][15][16][17] the sensing of Hg(II), has, to the best of our knowledge, not been achieved previously using lanthanide luminescence, and hence sensor 1.Tb.Na is the first example of a lanthanide sensor for targeting this ion.…”

“…5,[10][11][12] Careful functionalisation of the macrocyclic framework, 1,4,7,10-tetraazacyclododecane (cyclen) has allowed for the formation of many examples of thermodynamically stable and kinetically inert complexes with Ln III ions, which have been employed in luminescent sensing of metal ions. [12][13][14][15][16][17] These possess a suitable antennae/receptor unit which can populate the lanthanide excited states via an energy sensitization process (e.g. the antenna effect); which are perturbed upon binding to ions, giving rise to changes in both the lanthanide emission intensities and lifetimes.…”

Coumarin-Derived Fluorescent Chemosensors

“…Coumarinyldithiane 11 and thiocoumarin 12 selectively sense Hg 2+ also due to the Hg 2+ -induced desulfurization reaction. Probe 14 belongs to the turn-on class of sensors, functioning via a PET process (Voutsadaki et al, 2010).…”

A Selective, Colorimetric and Ratiometric Chemosensor for Hg2+ and Its Application as Test Papers

“…Namely, the fluorescence intensity of the sensor shows great increase (29 times) upon the addition of Hg 2+ ions via photoinduced electron transfer (PET). 25 Besides, other kinds of coumarin-based sensors have also been developed based-on intra-molecular charge transfer (ICT) 26,27 or fluorescence resonance energy transfer (FRET). 28 However, much work is required to synthesize the above-mentioned sensor molecules.…”