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Spectrophotometric and Polarographic Studies on 9,10‐Anthradione‐2‐Sodium Sulfonate
Author(s) -
ElMaraghy Salah B.,
Ebied M. F. E.,
ElWafa S.
Publication year - 1981
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198100024
Subject(s) - chemistry , sulfonate , semiquinone , anthraquinone , inorganic chemistry , photochemistry , redox , sodium carbonate , ionic bonding , solvent , aqueous solution , ethanol , sodium , alcohol , ionic strength , substrate (aquarium) , ion , organic chemistry , oceanography , geology
The 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 H 2 SO 4 but was unchanged by increase of ionic strengh with (NH 4 ) 2 SO 4 . 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.