Superoxide protonation by weak acids in imidazolium based ionic liquids

Journal of Physical Chemistry B

Volumn 113, Issue 9, 2009, Pages 2826-2831

  René, Alice ^a,b   Hauchard, Didier ^a,b   Lagrost, Corinne ^a,c   Hapiot, Philippe ^a,c  

^a INSTITUT DES SCIENCES CHIMIQUES DE RENNES   (France)

^b UNIV RENNES   (France)

^c UNIVERSITÉ DE RENNES 1   (France)

Author keywords

[No Author keywords available]

Indexed keywords

DIMETHYLFORMAMIDE; IONIC LIQUIDS; IONIZATION OF LIQUIDS; IONS; ORGANIC SOLVENTS; OXYGEN; PROTONATION;

ELECTRON MECHANISMS; ELECTRON TRANSFERS; IMIDAZOLIUM-BASED IONIC LIQUIDS; OXIDATION POTENTIALS; QUALITATIVE ANALYSIS; SUBSTITUTED PHENOLS; SUPEROXIDE; SUPEROXIDE ANIONS; SUPPORTING ELECTROLYTES; VOLTAMMOGRAM; WEAK ACIDS; [BMIM][TFSI];

PHENOLS;

EID: 63049133414     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp810249p     Document Type: Article

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52. In principle, precise comparisons of the experimental data with the relevant theoretical curves calculated for the DISP1 or DISP2 mechanisms (variation of the reversibility with the scan rate in cyclic voltammetry or the phenol concentration) may be used to discriminate between the two limiting subcases.32 This strategy was used with success for characterizing the reduction mechanism of O2 in organic media (DMF or DMSO).18 However, the procedure requires very precise data and negligible interferences of other decay processes of the electrogenerated superoxide for allowing the extraction of the experimental data on a large range of the kinetic parameter (2-3 orders of variations) which was not possible in the present situation.
53. The method consists in comparing the experimental reversibility estimated as the ratio between the anodic and cathodic peak currents with simulated curves. (For a more detailed presentation, see page 85 in ref 30). This approach is very similar to the DSP technique used in ref 18 but simulations of the voltammograms require the injection in the calculations of an estimation of the intrinsic electron transfer rate constant, k s, and of the diffusioncoefficientsD O2andD O2- ·previouslymeasuredin[BMIm][TFSI].9