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Spectroelectrochemical studies on redox reactions of eosin Y and its polymerization with Zn2+ ions
- Source :
-
Journal of Electroanalytical Chemistry . Nov2011, Vol. 662 Issue 2, p384-395. 12p. - Publication Year :
- 2011
-
Abstract
- Abstract: Redox reactions of eosin Y (EY) in aqueous solutions in the presence and absence of Zn2+ were studied by spectroelectrochemical measurements combining cyclic voltammetry and in situ monitoring of absorption spectra, employing an optically transparent thin layer electrode (OTTLE). In the absence of Zn2+, the original dianion, EY2−, undergoes one electron reduction to trianion radical that is stable above pH 11, but is protonated and doubly reduced under the lower pH to become highly stabilized against re-oxidation. When Zn2+ is present, the reduction occurs as a two electron process coupled with complexation of two Zn2+ ions to bridge eosin Y molecules, resulting in polymeric mixed aggregates that are also greatly stabilized against re-oxidation. This reaction has been identified as the key process in the electrochemical self-assembly of ZnO/eosin Y hybrid thin films in nanowire structures. On the other hand, two electron oxidation of EY2− was found to convert the molecule into lactone form which is strongly stabilized against re-reduction. Despite of such highly complex redox reactions, these processes in overall were found to be reversible both electrochemically and spectroscopically. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 15726657
- Volume :
- 662
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Electroanalytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 67143653
- Full Text :
- https://doi.org/10.1016/j.jelechem.2011.09.008