Investigation of interfacial processes at tetraruthenated zinc porphyrin films using electrochemical surface plasmon resonance and electrochemical quartz crystal microbalance
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- 作者：Rodrigo A.A. Munoz ; Sergio H. Toma ; Henrique E. Toma ; Koiti Araki ; Lú ; cio Angnes
- 关键词：Tetraruthenated porphyrin ; Electrochemical surface plasmon resonance ; Electrochemical quartz crystal microbalance ; Phenolic compounds ; Electrocatalytic oxidation
- 刊名：Electrochimica Acta
- 出版年：2009
- 出版时间：15 April 2009
- 年：2009
- 卷：54
- 期：11
- 页码：2971-2976
- 全文大小：705 K
文摘
In the present work we describe the investigation of interfacial and superficial processes on tetraruthenated zinc porphyrin (ZnTRP) films immobilized on gold electrode surface. In situ and real time measurements employing electrochemical surface plasmon resonance (ESPR) and electrochemical quartz crystal microbalance (EQCM) have given new insights into the electrochemical oxidation of ferrocyanide and phenolic compounds (acetaminophen, dopamine, and catechol) on ZnTRP modified electrodes. The decrease of diode like behavior in the presence of such phenolic species in contrast with ferrocyanide was clearly assigned to the inclusion of those species in the porphyrin film, creating new conduction pathways connecting the gold electrode surface with the film/solution interface. In fact, there are evidences that they can intercalate in the film (catechol > dopamine > acetaminophen), whereas ferrocyanide is completely excluded. Accordingly, the molecular size may play a fundamental role in such a process.