Ferrocene-substituted calix[4]pyrrole modified carbon paste electrodes for anion detection in water

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 591; no. 2; pp. 223 - 228
• Main Authors: Szymańska, Iwona, Radecka, Hanna, Radecki, Jerzy, Gale, Philip A., Warriner, Colin N.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2006; Elsevier Science
• Subjects: Analytical chemistry; Calixpyrrole; Carbon paste electrodes; Chemistry; Exact sciences and technology; Ferrocene; General, instrumentation; Ion-selective electrode; Osteryoung square wave voltammetry; Potentiometry; Calixpyrrole; Osteryoung square wave voltammetry; Potentiometry; Ion-selective electrode; Ferrocene; Carbon paste electrodes; Performance evaluation; Carbon electrode; Chemical sensor; Electrochemical detector; Ion selective electrode; Inorganic anion; Ionic selectivity; Halides; Molecular recognition; Paste electrode; Aqueous solution; Modified material
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2006.04.007

A neutral redox-active receptor (ferrocene functionalized calix[4]pyrrole) was used as an active component in carbon paste electrodes and ion-selective electrodes ISEs, for the detection of anions in aqueous solution. Measurements with the carbon paste electrodes were conducted using Osteryoung square-wave voltammetry. At the surface of the modified electrode the redox potential of ferrocene-substituted calix[4]pyrrole was found to be at ca. 400 mV. Amongst the anions studied, dihydrogen phosphate and fluoride caused the strongest decrease of peak current (approximately 25%), followed by bromide and chloride. This sensitivity sequence was compared with that obtained with ISEs containing the ferrocene-substituted calix[4]pyrrole. The influence of the interface between host molecule environment and aqueous solution containing target anion on the molecular recognition process and electrochemical signal generation has been investigated.