Recognition of anions using metalloporphyrin-based ion-selective membranes:: State-of-the-art

The principles, recent achievements and challenges related to the use of metalloporphyrins as ionophores in the development of polymeric anion-selective membranes are reported. The advantages and disadvantages of dimer-monomer equilibria existing within the membrane phase when using certain metalloporphyrins are discussed with respect to their effect on the response characteristics of the resulting anion sensors. The influence of membrane composition and pH of sample solution on these equilibria is described. The possibility of employing both potentiometric and optical transduction modes for anion recognition with metalloporphyrin doped polymer membranes is shown.