The mechanism for the cathodic reduction of sulphur in dimethylformamide: low temperature voltammetry

Using voltammetry at low temperatures, it is demonstrated that the reduction of sulphur (S 8) in dimethylformamide (DMF) occurs in a 2e − step and the form of the voltammogram observed depends on the stability of the S 8 2− formed. At 223 K, it is stable. In contrast, at ambient temperatures it clea...

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Bibliographic Details
Published inElectrochemistry communications Vol. 3; no. 9; pp. 514 - 518
Main Authors Evans, A., Montenegro, M.I., Pletcher, D.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.09.2001
Amsterdam Elsevier Science
New York, NY
Subjects
Chemistry
Chemistry of [formula omitted]
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
Sulphur reduction
Temperature effects
Voltammetry
Chemistry of S 8 2
Voltammetry
Sulphur reduction
Temperature effects
Chemical reduction
Organic solvent
N,N-Dimethylformamide
Temperature effect
Reaction mechanism
Diffusion coefficient
Experimental study
Electrochemical reaction
Carbon
Disk electrode
Glassy state
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Summary:Using voltammetry at low temperatures, it is demonstrated that the reduction of sulphur (S 8) in dimethylformamide (DMF) occurs in a 2e − step and the form of the voltammogram observed depends on the stability of the S 8 2− formed. At 223 K, it is stable. In contrast, at ambient temperatures it cleaves rapidly to give two S 4 − anions and at more negative potentials, S 4 − is reduced further in a reversible 1e − process. The diffusion coefficient for S 8 is a function of temperature and this leads to a substantial change to the current densities for the responses with temperature.
ISSN:1388-2481
1873-1902
DOI:10.1016/S1388-2481(01)00203-X