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Details van artikel 39 van 116 gevonden artikelen
| Titel: |
EVIDENCE OF A STABLE CHARGE-TRANSFER ADDUCT BETWEEN 2-MERCAPTOETHANOL AND COBALT-POLYTETRAAMINOPHTHALOCYANINE |
| Auteur: |
Ardiles, P. Trollund, E. Isaacs, M. Armijo, F. Aguirre, M. J. |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 54 (2001) nr. 3-4 pagina's 183-191 |
| Jaar: |
2001-11-01 |
| Inhoud: |
The electro-oxidation of 2-mercaptoethanol by poly-Co-tetraaminophthalocyanine (p-Co-TAPc) and poly-metal-free-tetraaminophthalocyanine (p-H2TAPc), absorbed on electrode surfaces has been investigated by UV-visible spectroelectrochemistry and electrochemical techniques. In the case of p-CoTAPc, an irreversible oxidation wave is obtained by cyclic voitammetry, whereas p-H2PcTA practically does not show activity. The foot of the oxidation, as the open circuit potential measurements indicate that the responsible redox couple is Co(II)/Co(I). The p-CoTAPc modified-electrode loses its activity after a first potential cycle. UV-visible spectroelectrochemical measurements show a charge transfer band (metal to ligand) for the p-CoTAPc between Q and Soret bands when negative potentials are applied and Co(I) is obtained. The presence of 2-mercaptoethanol promotes the appearance of the charge transfer band at open circuit potential and retain this band even at potentials as positive as +0.2V where normally the Co center is in +2 oxidation state. The permanence of a stable charge transfer band indicates the formation of a stable charge-transfer adduct between Co(I) and the thiol. This adduct would be responsible for the loss of catalytic activity for p-CoTAPc after the first oxidation cycle. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 39 van 116 gevonden artikelen
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