The reduction of sulphur and the redox properties of polysulphide anions in dimethylformamide (DMF) were studied by time-resolved spectroelectrochemistry, coupling cyclic voltammetry with micro-Raman spectrometry. The measurement system allows one to record several spectra in real time during the potential scan of the working electrode. The data obtained under thin-layer conditions, at room temperature, were compared with those obtained by cyclic voltammetry and by visible time-resolved spectrophotometry. The variations of the Raman (535 cm-1) and visible (610 nm) characteristics of the radical anion S3- during the potential scan for S8–DMF and Li2S6–DMF solutions are presented and these results are discussed.
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Gaillard et al. (1997) studied this question.