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Thiophene-based electrochemically active probes for selective calcium detection

Abstract : 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+).
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Rihab Sahli, Noureddine Raouafi, Emmanuel Maisonhaute, Khaled Boujlel, Bernd Schöllhorn. Thiophene-based electrochemically active probes for selective calcium detection. Electrochimica Acta, Elsevier, 2012, 63, pp.228-231. ⟨10.1016/j.electacta.2011.12.108⟩. ⟨hal-00789567⟩



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