Abstract
AbstractThe effect of solvent structure on the rates of redox reactions in alcohol+water mixture was discussed by some authors. The rate of photoreduction of 9,10‐anthraquinone‐2‐sulfonate was decreased by addition of H2SO4 but was unchanged by increase of ionic strengh with (NH4)2SO4. The magnitude of the decrease in presence of acid was greater with ethanol or isopropanol than with N‐ethylacetamide as substrate. The formation of semiquinone and carbonate radical anions was observed(4) during the direct photoreaction. The electron transfer from the carbonate anion to sulfoanthraquinone in the first excited triplet state was the controlling step of this process. Therefore, anthraquinone β‐sodium sulfonate is efficient sensitizers of the photooxidation of organic substrates in aqueous media.
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