Studying ion transfers across a room temperature ionic liquid│aqueous electrolyte interface driven by redox reactions of lutetium bis (tetra-tert-butylphtalocyannato). - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of electroanalytical chemistry and interfacial electrochemistry Année : 2007

Studying ion transfers across a room temperature ionic liquid│aqueous electrolyte interface driven by redox reactions of lutetium bis (tetra-tert-butylphtalocyannato).

Résumé

Ion transfer reactions across the interface between an aqueous electrolyte solution and the room temperature ionic liquid (RTIL) 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate ([hmim][fap]) were studied with the help of threephase electrodes. The electrode assembly comprised an edge plane pyrolytic graphite electrode modified with a thin layer of [hmim][fap] containing lutetium bis(tetra-tertbutylphthalocyaninato) (Lu[tBu4Pc]2) as redox probe. Lu[tBu4Pc]2 can be oxidized and reduced to a stable hydrophobic monovalent cation and anion, respectively, hence allowing investigation of the transfer of cations and anions in one and the same voltammetric experiment. In spite of the strong hydrophobicity of the salt [hmim][fap], the electrode reactions of the redox probe studied in contact with various inorganic aqueous electrolytes, were frequently accompanied by expulsion of ions constituting the RTIL into the aqueous phase. Using ionic chromatography it was found that the distribution of ions in the aqueous electrolyte/RTIL biphasic system is strongly determined by ion exchange reactions.

Dates et versions

hal-00456815 , version 1 (15-02-2010)

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Citer

Francois Quentel, Catherine Elleouet, Valentin Mirceski, Victor Agmo Hernandez, Maurice L'Her, et al.. Studying ion transfers across a room temperature ionic liquid│aqueous electrolyte interface driven by redox reactions of lutetium bis (tetra-tert-butylphtalocyannato).. Journal of electroanalytical chemistry and interfacial electrochemistry, 2007, 611, pp.192-200. ⟨10.1016/j.jelechem.2007.08.011⟩. ⟨hal-00456815⟩
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