The optical and colorimetric sensing properties of H2L1–H2L3 for anions were investigated by the naked eye and UV-Vis and fluorescence spectroscopy. The spectral change of H2L1–H2L3 is due to the anion induced deprotonation and hence an increase in charge density and rigidity of the receptor molecule. The anion sensing abilities of the receptors toward halide anions were also monitored by electrochemical techniques.
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