Sodium-Selective Polymeric Membrane Electrodes Based on Calix[4]arene Derivatives

Abstract

Four kinds of lipophilic calix [4]aryl ester

Anion selectivities of membranes based on HgII complexes of calix[4]arene derivatives

“…Calix [4]arenes are well-known and widely applied compounds in ion recognition and 'host-guest' chemistry. The recognition of specific ions by these receptors is determined by the cavity size and the kind of functional groups attached to the aromatic rings.…”

“…The recognition of specific ions by these receptors is determined by the cavity size and the kind of functional groups attached to the aromatic rings. Because of the selective ion complexation, various derivatives of calix [4]arene have been used as ionophores in membrane electrodes that are selective towards sodium [1-7], potassium [8, 91 or cesium [lo] cations. Replacements of the hard oxygen donor atoms by softer nitrogen or sulfur donor atoms in functional groups of calix [4]arenes lead to membrane electrodes that are selective towards transition metal cations, e.g., silver [l l-131, cadmium, copper [ 1 I] and lead [ 11, 141.…”

“…Because of the selective ion complexation, various derivatives of calix [4]arene have been used as ionophores in membrane electrodes that are selective towards sodium [1-7], potassium [8, 91 or cesium [lo] cations. Replacements of the hard oxygen donor atoms by softer nitrogen or sulfur donor atoms in functional groups of calix [4]arenes lead to membrane electrodes that are selective towards transition metal cations, e.g., silver [l l-131, cadmium, copper [ 1 I] and lead [ 11, 141. There are no reports on the application of calix [4]arenes as electroactive components in membrane anion-selective electrodes.…”

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AbstractAnion selectivities of membranes based on cationic complexes of thioamide calix [4]arene derivatives are presented for the first time. Hg" complexes of thioamide derivatives of calix [4]arene were applied to design perchlorate-selective ISEs which show linear responses in the range 1-5 of pCI04 with a slope of 56.5mV decade-'.

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“…Hg" complexes of thioamide derivatives of calix [4]arene were applied to design perchlorate-selective ISEs which show linear responses in the range 1-5 of pCI04 with a slope of 56.5mV decade-'. The highest selectivity over other anions (except iodides) and optimum performances of electrodes were obtained for a 0.01 M solution of Hg" as an internal electrolyte.…”