A porphyrin-based ion pair receptor constructed through click chemistry

A novel heteroditopic porphyrin-based ion pair receptor with four ureas and four triazoles on the same side of the porphyrin ring was synthesized through click chemistry. This receptor showed high affinity to complex with the ion pairs KCl, NaCl and NH 4 Cl in 1:1 binding stoichiometries with association constants of 2.48 (± 0.43) × 10 4 , 1.06 (± 0.02) × 10 5 , and 1.97 (± 0.04) × 10 5 M[Formula: see text], respectively. After complexation with the ion pairs, fluorescence quenching of the porphyrin was observed, which enables its potential applications in ion detection.