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Anomalous potential response of sodium ion-sensing membrane containing a proton-dissociable calix[4]arene ionophore

Keiichi Kimura, Akio Sakai, Masaaki Yokoyama

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Abstract

Ion-selective electrodes of plasticized-poly(vinyl chloride) membranes containing a proton-dissociable calix[4]arene ionophore, which carries three ethyl-ester groups and a carboxylic group at the lower rim, show super-Nernstian response to Na− activity changes in the high activity ranges under weakly-acidic and neutral-pH conditions. It is proposed that the anomalous potential response is due to enhanced cation complexation by the calixarene ionophore, which is in turn induced by intramolecular interaction of the hydroxyl part of the carboxylic group and Na+ captured by the ionophoric cavity in the calixarene complex.

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What this paper is about

Ion-selective electrodes of plasticized-poly(vinyl chloride) membranes containing a proton-dissociable calix[4]arene ionophore, which carries three ethyl-ester groups and a carboxylic group at the lower rim, show super-Nernstian response to Na− activity changes in the high activity ranges under weakly-acidic and neutral-pH conditions. It is proposed that the anomalous potential response is due to enhanced cation complexation by the calixarene ionophore, which is in turn induced by intramolecular interaction of the hydroxyl part of the carboxylic group and Na+ captured by the ionophoric cavity in the calixarene complex.

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Available abstract

Ion-selective electrodes of plasticized-poly(vinyl chloride) membranes containing a proton-dissociable calix[4]arene ionophore, which carries three ethyl-ester groups and a carboxylic group at the lower rim, show super-Nernstian response to Na− activity changes in the high activity ranges under weakly-acidic and neutral-pH conditions. It is proposed that the anomalous potential response is due to enhanced cation complexation by the calixarene ionophore, which is in turn induced by intramolecular interaction of the hydroxyl part of the carboxylic group and Na+ captured by the ionophoric cavity in the calixarene complex.

Key concepts: Ionophore, Chemistry, Calixarene, Membrane, Proton, Ion, Sodium, Intramolecular force

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