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UV-vis absorbance (a) and fluorescence emission (b) spectral changes of L3 with Al3+ as a function of pH. Inset: Color changes of probe + Al3+ in different pH media under a normal (a) and UV (b) lamp (top), absorbance (a, at 557 nm) and emission (b, at 587 nm) intensities of L3 in the presence of Al3+ with pH variation (bottom).
