Date of Award
Doctor of Philosophy (PhD)
Reactive intermediates in the reduction of anthraquinone-2,6-disulfonate (AQDS) by dithionite combine to form a transient dimer which has shown to give rise to a series of charge transfer bands in the visible range (600-750 nm). Additional wavelengths associated with these intermediate species have been observed at wavelengths 402, 444 and 510 nm. These transient intermediates are generated as dithionite decomposition products re-oxidize AQDS. Evidence of the dimer was also found in experiments in which reduction of AQDS was achieved electrochemically by the use of a potentiostat. This implies three things: 1. dithionite is not required for dimerization of reactive intermediates; 2. the dimerization reaction is reversible; 3. the dimer formation reaction involves an intermediate common to both oxidation and reduction.
In addition our studies have also led to evidence of such a dimer in unbuffered aqueous solution at neutral pH. Dimer formation is enhanced in the presence of clay. Clay appears to stabilize the dimer species via both kinetic and thermodynamic effects.
Weiss, Anna, "Spectroelectrochemical Studies of the Reductive Intermediates of Anthraquinone-2,6-Disulfonate in Aqueous Media" (2012). Dissertations. 408.
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Copyright © 2012 Anna Weiss