NEUTRAL CARRIER MEMBRANE-ELECTRODE BASED ON BINUCLEAR METALLOPORPHYRIN

A new kind of neutral carrier is described, binuclear metalloporphyrin , which exhibits the anti-Hofmeister selectivity pattern for anions. A comparison of potentiometric response characteristics between the bin uclear and mononuclear metalloporphyrins is discussed in view of the c oordination chemistry of metalloporphyrins. The interaction between th e ionophore and the analyte anion was investigated by UV/Vis and IR sp ectroscopy. The transfer process of the analyte anion across the membr ane interface was studied by A.C. impedance measurements. The origin o f the anti-Hofmeister selectivity sequence was explored by quantum che mical calculations.