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Infrared and UV–vis spectra of phenoxonium cations produced during the oxidation of phenols with structures similar to vitamin E by Shanshan Chen; Hong Mei Peng; Richard D. Webster is a Engineering article available to read on EtoBox.

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Several phenols with structures similar to vitamin E were oxidised and the intermediate species produced were characterised by in situ infrared and UV-vis spectroscopies. The Fourier transform infrared (FTIR) measurements were performed by chemically oxidising the phenols with 2 mol equiv. of NO + SbF 6 -in CH 3 CN and recording the spectra between 1900 and 1300 cm -1 with an attenuated total reflectance (ATR) probe utilising a fiber conduit and a diamond composite sensor. The compounds that formed long-lived phenoxonium cations displayed two IR absorbances at 1665 (±15) cm -1 and one at 1600 (±10) cm -1 associated with the carbonyl, symmetric ring stretch and asymmetric ring stretch modes. The paraquinones are one of the long-term products of oxidation of the phenols, and displayed solution phase IR absorbances at 1650 (±10) cm -1 . In situ electrochemical UV-vis experiments performed during the oxidation of the phenols led to the detection of bands due to the phenoxonium cations at 295 (±5) and 440 (±15) nm and due to the para-quinones at 260 (±10) nm. The concentration of the substrate and the water content of the solvent had a major effect on the yields of the intermediates and

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Author

Shanshan Chen; Hong Mei Peng; Richard D. Webster

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)