The metalloporphyrin ligand bearing incorporated anion-exchanger fragment, 5-[4-(3-trimethylammonium)propyloxyphenyl]-10,15,20-triphenylporphyrinate of Co(II) chloride, CoTPP-N, has been tested as anion-selective ionophore in PVC-based solvent polymeric membrane sensors. A plausible sensor working mechanism includes the axial coordination of the target anion on ionophore metal center followed by the formed complex aggregation with the second ionophore molecule through positively charged anion-exchanger fragment. The UV-visible spectroscopic studies in solution have revealed that the analyte concentration increase induces the J-type porphyrin aggregation. Polymeric membranes doped with CoTPP-N showed close to the theoretical Nernstian response toward nitrite ion, preferably coordinated by the ionophore, and were dependent on the presence of additional membrane-active components (lipophilic ionic sites and ionophore) in the membrane phase. The resulting selectivity was a subject of specific interaction and/or steric factors. Moreover, it was demonstrated theoretically and confirmed experimentally that the selection of a proper ratio of ionophore and anionic additive can optimize the sensor selectivity and lifetime.

Lvova, L., Monti, D., Di Natale, C., Paolesse, R. (2021). The long-lasting story of one sensor development: from novel ionophore design toward the sensor selectivity modeling and lifetime improvement. SENSORS, 21(4), 1-15 [10.3390/s21041401].

The long-lasting story of one sensor development: from novel ionophore design toward the sensor selectivity modeling and lifetime improvement

Lvova L.
;
Monti D.;Di Natale C.;Paolesse R.
2021-01-01

Abstract

The metalloporphyrin ligand bearing incorporated anion-exchanger fragment, 5-[4-(3-trimethylammonium)propyloxyphenyl]-10,15,20-triphenylporphyrinate of Co(II) chloride, CoTPP-N, has been tested as anion-selective ionophore in PVC-based solvent polymeric membrane sensors. A plausible sensor working mechanism includes the axial coordination of the target anion on ionophore metal center followed by the formed complex aggregation with the second ionophore molecule through positively charged anion-exchanger fragment. The UV-visible spectroscopic studies in solution have revealed that the analyte concentration increase induces the J-type porphyrin aggregation. Polymeric membranes doped with CoTPP-N showed close to the theoretical Nernstian response toward nitrite ion, preferably coordinated by the ionophore, and were dependent on the presence of additional membrane-active components (lipophilic ionic sites and ionophore) in the membrane phase. The resulting selectivity was a subject of specific interaction and/or steric factors. Moreover, it was demonstrated theoretically and confirmed experimentally that the selection of a proper ratio of ionophore and anionic additive can optimize the sensor selectivity and lifetime.
2021
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
English
co-porphyrin ligand
solvent polymeric membranes
J-type porphyrin aggregation
nitrite sensing
Lvova, L., Monti, D., Di Natale, C., Paolesse, R. (2021). The long-lasting story of one sensor development: from novel ionophore design toward the sensor selectivity modeling and lifetime improvement. SENSORS, 21(4), 1-15 [10.3390/s21041401].
Lvova, L; Monti, D; Di Natale, C; Paolesse, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/272844
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