Roles of 4,4'-bipyridyl and bis(4-pyridyl) disulphide in the redox reaction of cytochrome c adsorbed on a gold electrode : Spectroelectrochemical studies

The redox behaviour of cytochrome c adsorbed on a gold electrode in the presence of so-called electron promoters, 4,4'-bipyridine (4-bipy) and bis(4-pyridyl) disulphide ((4-PyS) 2), has been investigated using the UV-visible electroreflectance technique. This method allows the determination of...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry and interfacial electrochemistry 1989-06, Vol.264 (1), p.157-165
Main Authors: Hinnen, Charlotte, Niki, Katsumi
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Study of interfaces
Online Access:Get full text
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Summary:The redox behaviour of cytochrome c adsorbed on a gold electrode in the presence of so-called electron promoters, 4,4'-bipyridine (4-bipy) and bis(4-pyridyl) disulphide ((4-PyS) 2), has been investigated using the UV-visible electroreflectance technique. This method allows the determination of the formal potential E° a of cytochrome c molecules in the adsorbed state. E° a at a bare electrode is about 0.5 V more negative than E° b of cytochrome c in the bulk state. This E° a value shifts in the positive direction when (4-PyS) 2 or 4-bipy is immobilized at the surface.
ISSN:0022-0728
DOI:10.1016/0022-0728(89)80154-8