Two pyridinium amide-based receptors L1 and L2 with a small difference of H-bond position
of the amide have been synthesized and characterized. Interestingly, they exhibited a huge difference in
sensing towards AcO- and H2PO4
-, respectively. Receptor L1 was found to be ‘naked-eye’ selective for
AcO- anions, while receptor L2 showed clear fluorescence enhancement selective to H2PO4
- anion. The
recognition ability has been established by fluorescence emission, UV-vis spectra, and 1HNMR titration.
Keywords: Pyridinium amide-based receptors, naked-eye selective, acetate ion, pyridinium, naked-eye, hydrogen bonding.
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