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Energetic scheme of the here used photoacid tris(2,2,2-trifluoroethyl) 8-hydroxypyrene-1,3,6-trisulfonate (TFEHTS) and its pKa values [34]. Solid lines represent absorption, and dashed lines denote fluorescence. The ROH* and RO−* are the protonated and deprotonated species of the photoacid in the exited state, respectively the pKa* signified the pKa value in the exited state.
