Publication
700
Electrochimica Acta, 63 (19),228-231, 2012
DOI: 10.1016/j.electacta.2011.12.108
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Thiophene-based electrochemically active probes for selective calcium detection |
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Rihab Sahlia, Noureddine Raouafia, Emmanuel Maisonhaute, Khaled Boujlela, Bernd Schöllhorn
Laboratoire de Chimie Analytique et d’Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Université de Tunis El-Manar, 2092 Tunis El-Manar, Tunisia - Laboratoire d’Electrochimie Moléculaire, UMR CNRS 7591, Université Paris Diderot, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France - Laboratoire Interfaces et Systêmes Electrochimiques, UPR 15 du CNRS, Université Pierre et Marie Curie Paris 06, Case Courrier no. 133, 4 place Jussieu, 75252 Paris Cedex 05, France - Laboratoire “Pasteur” UMR CNRS 8640, Ecole Normale Supérieure, Université Pierre et Marie Curie-Paris 6, 24 rue Lhomond, 75231 Paris Cedex 05, France
Electrochemically active probes containing a tetraalkylated p-phenylenediamine redox responsive moiety and thiophene ligands were found to be sensitive to calcium ions. The electrochemical studies revealed that these compounds were able to bind Ca2+ ions. The redox properties of the transducer underwent dramatic changes upon calcium chelation provoking large oxidation potential shifts comprised between 549 and 911 mV. A high selectivity towards Ca2+ over Zn2+ was observed. The zinc complex was found to spontaneously undergo metal ion exchange in presence of Ca2+ yielding [Ca(L)2]2+. |