Abstract
Ion-channel-mimetic sensing based on monolayers of a hydrogen bond-forming bis(thiourea) receptor was used to detect inorganic anions. Receptor monolayers were formed at the air−water interface and subsequently contacted with a highly oriented pyrolytic graphite electrode. Horizontal touch cyclic voltammetry was performed with subphase solutions containing various electroinactive analyte anions and [Fe(CN)6]4- as electroactive marker. Binding of analyte anions to the receptor monolayer was found to inhibit [Fe(CN)6]4- oxidation. The influences of the analyte anions on the cyclic voltammograms were largest for HPO42- and decreased in the order of HPO42- > F- ≈ SO42- > CH3COO- > Cl-, whereas ion-selective electrodes (ISEs) containing the same receptor respond with a selectivity order of Cl- > SO42- > CH3COO- > H2PO4-/HPO42-. Because the bis(thiourea) receptor does not bind to all potentially hydrogen-bonding sites of most of these anions, it is apparent that several of the larger anions, and in particular p...
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