Fluorescent Turn-on Probe Based on Napthalimide Fused Triphenylamine Unit for Quickly Detecting Thiophenol in Aqueous Solution

Abstract

A novel molecular probe system(NapTpa-dnbs) was prepared based on the chromophore napthalimide fused triphenylamine unit. NapTpa-dnbs was tuned to absorb a large fraction of UV and near-infrared radiation. The turn-on fluorescent response of NapTpa-dnbs to thiophenol caused an increased fluorescent emission by a factor of 11.5 at 597 nm in a PBS buffer solution. The photoinduced electron transform(PET) process of the probe became less feasible with the addition of thiophenol than that of the free probe. NapTpa-dnbs demonstrated high selective and sensitive detection toward thiophenol with respect to other competitive amine acids. The detection limit was determined to be 2.03×10⁻⁷ mol/L thiophenol. The sensing process is rapid(3 min). NapTpa-dnbs can accurately detect the thiophenol with a qualified recovery in real water samples. NapTpa-dnbs on test strips can detect the thiophenol vapour in the atmosphere.

Keywords

Napthalimide / Probe / Thiophenol / Turn-on / Fluorescent

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