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Simple NIR-Emitting ESIPT Fluorescent Probe for Thiophenol with a Remarkable Stokes Shift and Its Application
Zhiying Li1, Yang Wu1, Youming Shen1
1Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Cooperative Innovation Center for The Construction & Development of Dongting Lake Ecological Economic ZoneCollege of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, P. R. China.
Abstract:
Thiophenol as a highly toxic compound can harm the environment and living organisms and thus demands effective detection. In this work, we presented a near-infrared fluorescent probe (DAPH-DNP) for detecting thiophenol according to the ESIPT mechanism using 2,4-dinitrophenyl group as a recognition unit. This probe displayed specificity toward thiophenol over other related analytes. Meanwhile, there was good linearity between the relative fluorescence intensity of DAPH-DNP and the concentration of thiophenol in the range of 0-80 μM. This probe also showed a low detection limit of 3.8 × 10-8 and a marked Stokes shift (192 nm). Further, this probe could be used for monitoring thiophenol in environmental water samples and imaging thiophenol in living cells, which indicated that this probe had a real application in the environment and living organisms.
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