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Application of quinone thio derivatives as a basis for assembling complex molecular systems at an electrode surface
Ist Teil von
Journal of electroanalytical chemistry (Lausanne, Switzerland), 1992-05, Vol.326 (1), p.197-212
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
1992
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Because of their strong adsorption on the surfaces of Au and amalgamated Pt electrodes thio derivatives of benzo- and naphthoquinones are able to form stable monolayer coatings. In contrast, quinone amino derivatives with similar structures cannot be used for electrode chemical modification since they are easily removed from the electrode surfaces with organic solvents or by cyclic scanning of a potential in aqueous solution. Benzoquinone thio derivatives immobilized at the electrode can react with alkyl and aryl amines and produce immobilized products with redox potentials shifted in the negative direction. The value of the potential shift depends on the electron-donating properties of the inserted amino group. This allows wide variations in the properties of chemically modified electrodes. The organic layer formed by the quinone thio derivatives can be used as the basis for immobilization of other redox components, for example porphyrin molecules covalently bound with quinone.