Abstract
A new tripodal receptor for anion sensing based on amide-pyridinium as recognition site and nitro-benzene as signaling unit was designed and successfully synthesized. This receptor showed high selectivity and strong binding affinity toward AcO− over the investigated anions, especially over H2PO4−. Addition of AcO− induced clear color change of solution from colorless to yellow, realizing the “naked-eye” detection. UV–Vis and 1H NMR experiments indicated the selectivity might origin from the synergistic effects arising from hydrogen bonding, electrostatic interactions and conformational change.
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