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The adsorption of tyrosine at Ag(110) and Ag(111) single crystal electrodes has been studied in aqueous solutions of 0.1 M LiClO4. The standard Gibbs energies of adsorption Delta G(0)-ads, at the potential of maximum adsorption and the interaction parameters, A, using Frumkin's isotherm were calculated. The orientation of the adsorbed tyrosine molecules is different on Ag(111) and Ag(110) electrodes. At Ag(111) the molecules adsorb flat with the benzene ring parallel to the electrode, whereas at Ag(110) electrode the orientation is propably vertical with OH group tawards the metal. The origin of that differences is propably the different atomic structure of both electrodes.
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Tom
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1096--1105
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Bibliogr. 26 poz., wykr.
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- Department of Chemistry Warsaw University ul. Pasteura 1 02-093 Warsaw Poland
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bwmeta1.element.baztech-article-BAR2-0001-0098