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Absorption (a, b) and emission spectra (c, d) of FL4 upon addition of CuCl2 or ZnCl2 at room temperature (20 mM HEPES, pH 7.4, 150 mM NaCl). Experimental conditions: [FL4] = 50 μM and 25 μM for UV-Vis and emission (λex = 383 nm) measurements, respectively.
