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Lutetium bis(tetra-tert-butylphthalocyaninato): A superior redox probe to study the transfer of anions and cations across the water|nitrobenzene interface by means of square-wave voltammetry at the three-phase electrode

Abstract : The redox properties of lutetium bis(tetra-tert-butylphthalocyaninato) (LBPC) have been studied in nitrobenzene that is deposited as a microfilm on the surface of highly oriented pyrolytic graphite electrodes. The behavior of the modified electrode, which is immersed in an aqueous electrolyte solution, is typical for the three-phase electrode (Scholz, F.; Komorsky-Lovrić, Š.; Lovrić, M. Electrochem. Comm. 2000, 2, 112-118). LBPC can be both oxidized and reduced in one electron reversible processes. The oxidation and the reduction of LBPC at the graphite|nitrobenzene interface is accompanied by the transfer of anion or cation, respectively, from the aqueous phase into the organic layer. Thus, using LBPC as a redox probe for the three-phase electrode, the transfer of both anions and cations across the water|nitrobenzene interface can be studied in a single experiment. The hydrophobicity of LBPC is so high that it enables inspection of cations and anions with ΔwnbGCat+θ ≤ 43 kJ/mol and Δwnb ≤ 50 kJ/mol, respectively. The direct transfer of Na+ and Li+ from water to nitrobenzene, mutually saturated, is achieved for the first time at a macroscopic water|nitrobenzene interface.
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https://hal.univ-brest.fr/hal-01763747
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Submitted on : Wednesday, April 11, 2018 - 1:42:30 PM
Last modification on : Monday, August 5, 2019 - 4:14:07 PM

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François Quentel, V. Mirčeski, Maurice l'Her. Lutetium bis(tetra-tert-butylphthalocyaninato): A superior redox probe to study the transfer of anions and cations across the water|nitrobenzene interface by means of square-wave voltammetry at the three-phase electrode. Journal of Physical Chemistry B, American Chemical Society, 2005, 109 (3), pp.1262-1267. ⟨10.1021/jp045914c⟩. ⟨hal-01763747⟩

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