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Fluorescence emission spectra comparison among the initial H2TPPS44− (blue trace), after the addition of NaCl (red trace) and the H4TPPS42− (black trace). Experimental conditions: [H2TPPS44−] = 3 μM; [HCl] = 0.3 M; [NaCl] = 0.2 M; λex = 420, T = 298 K.
