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Theory of normal-pulse voltammetric current of electron transfer reaction at liquid/liquid interface
- Source :
-
Journal of Electroanalytical Chemistry . May2006, Vol. 590 Issue 1, p82-89. 8p. - Publication Year :
- 2006
-
Abstract
- Abstract: Theory of normal-pulse voltammetric current of electron transfer (ET) reaction at organic solvent(O)/water(W) interface between a redox couple of A species, ARED and AOX, in O phase and another redox couple of B species, BOX and BRED, in W phase has been discussed. ARED is supposed to be a neutral molecule and AOX a cation, whereas both BRED and BOX are supposed to be highly hydrophilic. Then, two kinds of the reaction mechanism, that is, (1) the heterogeneous ET reaction: ARED(O)+BOX(W)=AOX(O)+BRED(W) at the O/W interface producing the voltammetric current, and (2) the transfer of ARED(O) molecule from O to W phase across the interface, then the homogeneous ET reaction: ARED(W)+BOX(W)=AOX(W)+BRED(W) in W phase, followed by the transfer of AOX(W) cation from W to O phase producing the voltammetric current, are considered. Theoretical equations of normal-pulse voltammetric current of the ET reaction at O/W interface are derived under the assumptions (i) that the ET reaction is pseudo-monomolecular with respect to A species, (ii) that the partition of ARED molecule between O and W phases is highly biased to O phase, and (iii) that the rate constants of homogeneous ET reaction in W phase are sufficiently large. Application of the theoretical equations to investigate the mechanism of the ET reaction at O/W interface has been discussed. [Copyright &y& Elsevier]
- Subjects :
- *OXIDATION-reduction reaction
*ORGANIC solvents
*VOLTAMMETRY
*CATIONS
Subjects
Details
- Language :
- English
- ISSN :
- 15726657
- Volume :
- 590
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Electroanalytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 20823628
- Full Text :
- https://doi.org/10.1016/j.jelechem.2006.03.001