Spectroelectrochemical Studies of the Reductive Intermediates of Anthraquinone-2,6-Disulfonate in Aqueous Media

<p>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.</p><p>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.</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Theology

Year dc:date.available

2012

Author dc:creator

• Weiss, Anna

• Chemistry

Repository record dc:identifier

https://ecommons.luc.edu/luc_diss/408

OAI identifier oai:identifier

oai:ecommons.luc.edu:luc_diss-1407