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In Situ ESR and UV/Vis Spectroelectrochemical Study of Eosin Y Upon Reduction with and without Zn(II) Ions
Author(s) -
Goux A.,
Pauporté T.,
Lincot D.,
Dunsch L.
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700009
Subject(s) - electron paramagnetic resonance , chemistry , semiquinone , eosin y , spectroscopy , electrochemistry , ion , eosin , zinc , photochemistry , aqueous solution , platinum , ultraviolet visible spectroscopy , inorganic chemistry , chloride , nuclear chemistry , electrode , redox , catalysis , nuclear magnetic resonance , photocatalysis , staining , organic chemistry , medicine , physics , quantum mechanics , pathology
The electroreduction of eosin Y on a platinum electrode in deaerated slightly acidic aqueous 0.1 mol L −1 potassium chloride medium is followed in situ by electron spin resonance (ESR) spectroscopy and UV/Vis spectroscopy. The electrochemical formation of a semiquinone radical is proved by both the appearance of an absorbing band at 408 nm, and a strong ESR signal observed during a negative‐going scan. The system is also studied in the presence of Zn II ions due to its importance for understanding the growth mechanism of nanostructured ZnO/Eosin Y hybrid films by electrodeposition; under such conditions the ESR and UV/Vis response of the semiquinone radical is not observed. Zinc (II) ions form a complex with the dye, which is reduced by a fast two‐electron process.