Two colorimetric indole-based Schiff base receptors containing electron-deficient 1,3-dinitrobenzenemotif, R1 and R2 were developed as a potential receptors for F¯ anion. Detailed UV-visible and 1H NMR studies revealed that the interactions of the receptor R2 with F¯ anions were driven by H-bondingfollowed by anion-induced deprotonation. The anion-receptor interactions produced distinct colorimetricchanges in solution, which was visible to the naked eye.
Volume 133, 2021
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