We have developed two near-infrared fluorescent probes for pH, named pH-A and pH-B. The fluorescence quantum yields of pH-A and pH-B are 0.19 and 0.095 in methanol. And there is the neutral pKa value of pH-A (pKa = 7.2). What is the most important is that these probes can stain the cells, which can reflect the changes of pH in cells.
X. Song, M. Hu, C. Wang and Y. Xiao, RSC Adv., 2016, 6, 69641 DOI: 10.1039/C6RA11637J
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