Substituted metalloporphyrin derivatives as anion carrier for PVC membrane electrodes

The lipophilic metalloporphyrin derivatives containing electron donating or withdrawing groups are used as anion carriers with selectivity characteristics deviated from classical Hofmeister series. The electron effect of the carrier on the selectivity characteristics has been interpreted in terms of the selective coordination action along the axial position of metallopor-phyrins. An metalloporphyrin derivative with electron-donating groups is preferred for the preparation of this type of anion-sensitive membrane electrodes.