| Autor: |
Antonio, Mark R., Soderholm, L., Jennings, G., Francesconi, Lynn C., Dankova, Michaela, Bartis, J. |
| Zdroj: |
Journal of Alloys and Compounds; July 1998, Vol. 275 Issue: 1 p827-830, 4p |
| Abstrakt: |
Europium L3edge X-ray absorption fine structure (XAFS) spectroelectrochemistry was used to determine the valence of europium in [Eu(α-2-As2W17O61)2]17−and [Eu(W5O18)2]9−. Dilute solutions of these anions in aqueous supporting electrolytes were examined at ambient temperature and at extreme potentials. In situ XANES (X-ray absorption near edge structure) data revealed that Eu is trivalent in both [Eu(α-2-As2W17O61)2]17−and [Eu(W5O18)2]9−at rest potential. Furthermore, it was not reduced to Eu2+by constant-potential bulk electrolysis at significantly reducing potentials under the electrochemical conditions used herein. These results stand in obvious contrast to the redox behavior of [EuP5W30O110]12−, in which Eu3+is reduced to Eu2+under similar electrochemical conditions. |
| Databáze: |
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