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Abstract

A simple internal reflection [attenuated total reflectance (ATR)] spectroelectrochemical cell has been used to obtain infrared spectra of the reduction products of anthaquinone-2-sulfonate, anthaquinone-2,7-disulfonate, and anthaquinone-1,5-disulfonate in aqueous tetraethylammonium hydroxide solutions. Discrete spectra of the anion radical and dianion of anthraquinone-2-sulfonate have been obtained. With each reduction step, the wavenumber of absorptions associated with the C–O bonds decreases while the corresponding absorption intensities markedly increase. The spectroelectrochemical cell contained a platinum grid working electrode and was attached to a ZnSe 45° single internal reflection prism. This type of spectroelectrochemical cell is convenient for studies of aqueous redox processes in the absence of interference from any buffering species.

Keywords

Infrared Spectroelectrochemistry ATR Anthraquinone sulfonates

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ATR Infrared Spectroelectrochemistry of the Reduction Products of Anthraquinone Sulfonates in Aqueous Solutions

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