Abstract
Fluorescein-rhodamine 6G(Flu-Rh) was synthesized and used as the fluorescence probe for pH measurement based on fluorescence resonance energy transfer(FRET). In the probe, fluorescein fluorophore and pH-sensitive rhodamine 6G hydrazide were used as FRET donor and acceptor, respectively. The values of acidity constant(pK a) and fluorescence quantum yield(Φ) of Flu-Rh were 3.71 and 0.72, respectively. The fluorescence efficiency of Flu-Rh remains almost constant when the pH value of the sample solution changed 10 times in a range of 4.78–7.03 continuously. The present probe is simple and easy-to-use for the pH measurement in acidic media.
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Supported by the National Natural Science Foundation of China(Nos.21405057, 21207047) and the Science and Technology Developing Foundation of Jilin Province, China(No.20125006).
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Liang, F., Wang, D., Ma, P. et al. A highly selective and sensitive ratiometric fluorescent probe for pH measurement based on fluorescence resonance energy transfer. Chem. Res. Chin. Univ. 31, 724–729 (2015). https://doi.org/10.1007/s40242-015-5124-0
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DOI: https://doi.org/10.1007/s40242-015-5124-0