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Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study

The electrochemistry of microcrystals of [(C4H9)4N][Cr(CO)5I] attached to a gold electrode which is placed in aqueous (lithium or tetrabutylammonium perchlorate) electrolyte media has been studied in detail by chronoamperometric, voltammetric and electrochemical quartz crystal microbalance (ECQCM) t...

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Main Authors: Bond, Alan M., Colton, Ray, Mahon, Peter J., Tan, Wee Tee
Format: Article
Language:English
Published: Springer 1997
Online Access:http://psasir.upm.edu.my/id/eprint/35817/1/35817.pdf
http://psasir.upm.edu.my/id/eprint/35817/
http://link.springer.com/article/10.1007%2Fs100080050022
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spelling my.upm.eprints.358172016-05-17T07:43:05Z http://psasir.upm.edu.my/id/eprint/35817/ Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study Bond, Alan M. Colton, Ray Mahon, Peter J. Tan, Wee Tee The electrochemistry of microcrystals of [(C4H9)4N][Cr(CO)5I] attached to a gold electrode which is placed in aqueous (lithium or tetrabutylammonium perchlorate) electrolyte media has been studied in detail by chronoamperometric, voltammetric and electrochemical quartz crystal microbalance (ECQCM) techniques. Whilst chronoamperometric and voltammetric measurements show that the expected one-electron oxidation of microcrystalline [Cr(CO)5I]− solid to Cr(CO)5I occurs at the solid-electrode-solvent (electrolyte) interface, the ECQCM measurements reveal that charge neutralization does not occur exclusively via the expected ejection of the tetrabutylammonium cation. Rather, uptake of ClO4 − occurs under conditions where the solubility of sparingly soluble [(C4H9)4N]ClO4 is exceeded. This is the first time that uptake of an anion rather than loss of a cation has been detected in association with an oxidation during electrochemical studies of microcrystals attached to electrode surfaces. It is therefore now emerging that analogous charge neutralization processes to those encounted in voltammetric studies on conducting polymers are available in voltammetric studies of microcrystals attached to electrodes which are placed in contact with solvent (electrolyte) media. In the presence of LiClO4 as the electrolyte, an ion exchange process occurs leading to formation of Li[Cr(CO)5I] . X H2O which then slowly dissolves in water at a rate that is strongly influenced by the electrolyte concentration, the relatively hydrophobic nature of the [(C4H9)4N]+ cation and the poor solubility of [(C4H9)4N]ClO4. Springer 1997 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/35817/1/35817.pdf Bond, Alan M. and Colton, Ray and Mahon, Peter J. and Tan, Wee Tee (1997) Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study. Journal of Solid State Electrochemistry, 1 (1). pp. 53-61. ISSN 1432-8488 http://link.springer.com/article/10.1007%2Fs100080050022 10.1007/s100080050022
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description The electrochemistry of microcrystals of [(C4H9)4N][Cr(CO)5I] attached to a gold electrode which is placed in aqueous (lithium or tetrabutylammonium perchlorate) electrolyte media has been studied in detail by chronoamperometric, voltammetric and electrochemical quartz crystal microbalance (ECQCM) techniques. Whilst chronoamperometric and voltammetric measurements show that the expected one-electron oxidation of microcrystalline [Cr(CO)5I]− solid to Cr(CO)5I occurs at the solid-electrode-solvent (electrolyte) interface, the ECQCM measurements reveal that charge neutralization does not occur exclusively via the expected ejection of the tetrabutylammonium cation. Rather, uptake of ClO4 − occurs under conditions where the solubility of sparingly soluble [(C4H9)4N]ClO4 is exceeded. This is the first time that uptake of an anion rather than loss of a cation has been detected in association with an oxidation during electrochemical studies of microcrystals attached to electrode surfaces. It is therefore now emerging that analogous charge neutralization processes to those encounted in voltammetric studies on conducting polymers are available in voltammetric studies of microcrystals attached to electrodes which are placed in contact with solvent (electrolyte) media. In the presence of LiClO4 as the electrolyte, an ion exchange process occurs leading to formation of Li[Cr(CO)5I] . X H2O which then slowly dissolves in water at a rate that is strongly influenced by the electrolyte concentration, the relatively hydrophobic nature of the [(C4H9)4N]+ cation and the poor solubility of [(C4H9)4N]ClO4.
format Article
author Bond, Alan M.
Colton, Ray
Mahon, Peter J.
Tan, Wee Tee
spellingShingle Bond, Alan M.
Colton, Ray
Mahon, Peter J.
Tan, Wee Tee
Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
author_facet Bond, Alan M.
Colton, Ray
Mahon, Peter J.
Tan, Wee Tee
author_sort Bond, Alan M.
title Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
title_short Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
title_full Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
title_fullStr Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
title_full_unstemmed Tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(C4H9)4N][Cr(CO)5I] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
title_sort tetrabutylammonium cation expulsion versus perchlorate electrolyte anion uptake in the electrochemical oxidation of microcrystals of [(c4h9)4n][cr(co)5i] mechanically attached to a gold electrode: a voltammetric and quartz crystal microbalance study
publisher Springer
publishDate 1997
url http://psasir.upm.edu.my/id/eprint/35817/1/35817.pdf
http://psasir.upm.edu.my/id/eprint/35817/
http://link.springer.com/article/10.1007%2Fs100080050022
_version_ 1643831566255783936
score 13.211869

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