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A fluorescent sensor based on phenylamine-oligothiophene derivative 3TEA was reported. This sensor showed highly selective and sensitive detection of Hg 2+ ion in THF/H 2 O (7/3, v/v) solution through fluorescence quenching. The detection was unaffected by other competitive metal ions. The detection limit was found to be as low as 3.952×10 −7 M estimated by the titration method. The recognition process is reversible and confirmed by EDTA experiment. The turn-off fluorescence behavior of mercury interaction with 3TEA has been found to be so fast that it can be used for its qualitative as well as quantitative estimation. [ABSTRACT FROM AUTHOR]

A phenylamine-oligothiophene-based fluorescent sensor 2TBEA was reported. This sensor exhibited highly selective, sensitive and rapid detection of Hg 2 + ion in THF/H 2 O (7/3, v/v) solution through fluorescence quenching. The detection was unaffected by the coexistence of other competitive metal cations including Na + , K + , Ag + , Ca 2 + , Fe 3 + , Al 3 + , Co 2 + , Cu 2 + , Ni 2 + , Zn 2 + , Pb 2 + , Cd 2 + , Fe 2 + and Cr 3 + . A1:1 binding ratio for 2TBEA — Hg 2 + was demonstrated by Job's plot and mole-ratio curves. The coordination process was chemically reversible with EDTA. The detection limit was evaluated to be as low as 6.164 × 10 − 8 M. [ABSTRACT FROM AUTHOR]

A fast-responsive fluorescent phenylamine-oligothiophene sensor 3TDDA was reported. This sensor exhibited highly selective and sensitive detection of Hg 2 + ion in aqueous solution (THF/CH 3 CN/H 2 O, 45/50/5, v/v) through fluorescence quenching. The detection was not affected by the coexistence of other competitive metal ions such as Na + , K + , Ag + , Ca 2 + , Fe 3 + , Al 3 + , Co 2 + , Ni 2 + , Zn 2 + , Pb 2 + , Cd 2 + , Fe 2 + and Cr 3 + . A stoichiometric ratio (1:1) of the sensor and Hg 2 + was determined by a Job's plot and mole-ratio curves. The binding of sensor 3TDDA and Hg 2 + was also chemically reversible with EDTA. The detection limit was calculated as low as 4.392 × 10 − 7 M. [ABSTRACT FROM AUTHOR]