Progress of 3-aminopyridinium-based synthetic receptors in anion recognition

Abstract

This review describes the overall development on synthetic receptors built on the pyridinium motif with different functionalities at the 3-position in anion recognition. The review covers only the organic systems. In the designs, the pyridinium group along with the other functional motifs plays a crucial role in the binding of various anions of different shapes and sizes. Complexation characteristics are communicated through changes in ¹H NMR, emission, color or gelation behaviours.