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

The mechanism for the cathodic reduction of sulphur in dimethylformamide: low temperature voltammetry
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 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.
sulphur reduction, chemistry of s-8(2-), voltammetry, temperature effects, electrochemical reduction, sulfur, solvents
1388-2481
514-518
Evans, A.
1cfe5902-0508-4a86-bbe2-72aa3a927f1a
Montenegro, M.I.
41167892-1c43-43a1-b9f3-4b7467671c39
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Evans, A.
1cfe5902-0508-4a86-bbe2-72aa3a927f1a
Montenegro, M.I.
41167892-1c43-43a1-b9f3-4b7467671c39
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30

Evans, A., Montenegro, M.I. and Pletcher, D. (2001) The mechanism for the cathodic reduction of sulphur in dimethylformamide: low temperature voltammetry. Electrochemistry Communications, 3 (9), 514-518. (doi:10.1016/S1388-2481(01)00203-X).

Record type: Article

Abstract

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.

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More information

Published date: 2001
Keywords: sulphur reduction, chemistry of s-8(2-), voltammetry, temperature effects, electrochemical reduction, sulfur, solvents

Identifiers

Local EPrints ID: 19473
URI: http://eprints.soton.ac.uk/id/eprint/19473
ISSN: 1388-2481
PURE UUID: bfa9dece-68d8-4c7a-8c0a-426a9ffcacd2

Catalogue record

Date deposited: 15 Feb 2006
Last modified: 15 Jul 2019 19:27

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