Premium
Mechanistic Determination Using Arrays of Variable Sized Channel Microband Electrodes: The Oxidation of 2,3,7,8‐Tetramethoxythianthrene in the Presence of Pyridine in Acetonitrile Solution
Author(s) -
Prieto Francisco,
Oyama Munetaka,
Coles Barry A.,
Alden John A.,
Compton Richard G.,
Okazaki Satoshi
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199808)10:10<685::aid-elan685>3.0.co;2-b
Subject(s) - pyridine , amperometry , reaction rate constant , chemistry , kinetics , acetonitrile , electrode , diffusion , analytical chemistry (journal) , electrochemistry , chromatography , organic chemistry , thermodynamics , physics , quantum mechanics
2‐Dimensional amperometry” using arrays of gold channel microband electrodes is applied to the oxidation of 2,3,7,8‐tetramethoxythianthrene (TMT) and to the characterization of the follow‐up kinetics of the resulting radical cation with pyridine. In the absence of pyridine the reaction is consistent with an E mechanism and a value of 1.3 × 10 −5 cm 2 s −1 is obtained for the diffusion coefficient of TMT. In the presence of pyridine the experimental results are consistent with a DISP2 mechanism where the values of the rate constant have a first order dependence on the concentration of pyridine. The following mechanism is proposed:and a value of 5.8 × 10 4 M −2 s −1 is found for the rate constant for the regeneration of TMT.