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Figure 4: Influence of pH on the fluorescence intensities. Experimental conditions: terazosin concentration 75 μg L−1; [Hpy][PF6] 150 mg; NaPF6 350 mg. Inset: chemical structure of terazosin. Acid base equilibrium involved at working pH. (a) Protonated form of this terazosin; (b) dissociated form of terazosin.