Role of axial ligation on potentiometric response of Co(III) tetraphenylporphyrin-doped polymeric membranes to nitrite ions

Potentiometric Membrane Electrode for Salicylate Based on an Organotin Complex with a Salicylal Schiff Base of Amino Acid

“…1 dissociates; especially, one of the Sn-O bonds dissociates and the overall charge on the Sn(IV) compound becomes 1+. 46,47 The selectivity of the Sn(IV)-SAADB-based membranes for salicylate over highly lipophilic anions, such as perchlorate, thiocyanate, iodide, and nitrate, clearly shows a deviation from the conventional Hofmeister anion response pattern. This may be interpreted in terms of the special interaction between the salicylate ions and the carrier incorporated in the membranes.…”

A poly(pyrrole-Cobalt(II)deuteroporphyrin) electrode for the potentiometric determination of nitrite

“…Beside immobilized iron and manganese porphyrins, cobalt complexes were also been investigated due to their promising functions as catalysts or selective complexing centers via axial ligation reactions. The latter were, for instance, successfully exploited for the study of phenol interaction [13], oxygen or NO reduction [14,15] and the detection of organohalide pollutants or nitrite [16][17][18].…”

Highly Selective Triiodide Polymeric Membrane Electrode Based on Tetra(p-chlorophenyl)porphyrinato Manganese (Ⅲ) Acetate

“…It has been shown that not only the presence of various anions as axial ligand but also the substitution of different groups on the porphyrin structure can strongly influence the selectivity pattern of the resulting membrane sensors for anionic species. 11,24 In the case of the ionophore used in this study, the presence of p-chloro substitution on the phenyl groups of porphyrin as well as the axial ligation of acetate ion seem to induce the selective behavior of the resulting membrane sensor towards I 3 − ion.…”

“…Metalloporphyrins, as ionophores for anions, show such specific metal-ligand interactions and also it is well stablished that the central metal and the bulkiness of the side chains that surround the porphyrin ring control the selectivity of the ISEs. 24 In this work, we were interested in investigating the possibility of the use of tetra(p-chlorophenyl)porphyrinato manganese(III) acetate, recently synthesized in our research laboratories, as an ionophore in PVC-based membranes for I 3 − ion. Thus, in preliminary experiments the mentioned ionophore was used to prepare PVC membrane ion-selective electrodes for a wide variety of anions.…”

“…The influence of porphyrin structure 11 as well as the axial ligation of Co(III)-tetraphenylporphyrin complex 24 on the potentiometric response and anion selectivity of the metalloporphyrin-based polymeric membranes have been reported in the literature. It has been shown that not only the presence of various anions as axial ligand but also the substitution of different groups on the porphyrin structure can strongly influence the selectivity pattern of the resulting membrane sensors for anionic species.…”