Thiophene Appended Dual Fluorescent Sensor for Detection of Hg and Cysteamine.

An efficient and highly selective pyrene-thiophene conjugate has been reported as a dual sensor for Hg and cysteamine (an important drug for genetic disorder). The sensor displays a turn-on fluorescence response towards Hg in a 2:1 stoichiometric ratio via excimer formation with a detection limit as low as of 30.6 nM.

A pyrene-based simple but highly selective fluorescence sensor for Cu(2+) ions via a static excimer mechanism.

A pyrene-based simple fluorosensor has been synthesized by a one step process. It exhibited high selectivity towards Cu(2+) ions via fluorescence enhancement of monomer and excimer emission. The origin of excimer formation was examined and established to be of static in nature from the study of absorption and excitation spectra.

Rhodamine-based Cu2+-selective fluorosensor: synthesis, mechanism, and application in living cells.

A rhodamine B-based fluorescence probe (1) for the sensitive and selective detection of Cu(2+) ion has been designed and synthesized using pyridine moiety. The optical properties of this compound have been investigated in acetonitrile-water binary solution (7:3 v/v). Compound 1 is found to be an excellent sensor for a biologically/physiologically very important transition metal ion (Cu(2+)) using only the two very different modes of measurements (absorption and emission); one case displayed intensity enhancement whereas in other case showed intensity depletion (quenching).

A rhodamine-based dual chemosensor for Cu(II) and Fe(III).

An "off-on" rhodamine-based fluorescence probe for the selective signaling of Cu(II) and Fe(III) has been designed and synthesized. The optical properties of this compound have been investigated in acetonitrile-water (1:1) binary solution. Very interestingly, this compound showed sensitivity and selectivity towards Cu(II) during absorption process and towards Fe(III) during emission process.