Triazole-bearing calixpyrroles: Strong halide binding affinities through multiple N-H and C-H hydrogen bonds

Triazole-bearing calixpyrroles (TCPs) were synthesized as artificial anion binding receptors. The additional C–H⋯X hydrogen bonding interaction induced strong binding affinity towards halide ions. Using this strong binding affinity, Cl− was successfully extracted from the aqueous to organic phase.