Electrochemistry and structure of the isomers of aminothiophenol adsorbed on gold.


Batz V, Schneeweiss MA, Kramer D, Hagenstrom H, Kolb DM, Mandler D. Electrochemistry and structure of the isomers of aminothiophenol adsorbed on gold. J. Electroanal. Chem.Journal of Electroanalytical Chemistry. 2000;491 (1,2) :55 - 68.

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The self-assembled monolayers (SAMs) of the three isomers of aminothiophenol, ATP, have been studied by means of electrochem., in-situ STM and XPS. We find that the isomers are organized differently. The organization is presumably governed by their intermol. and surface interactions. Moreover, the chem. and phys. characteristics of the interface are significantly and differently affected by the isomers comprising the SAMs. The electrochem. of the modified surface as well as the bare gold surface in contact with the thiol-contg. electrolyte, copper deposition and palladium(II) extn. have been studied for the 2-, 3- and 4-ATP monolayers. The organization of the layers has been investigated by STM. In essence, we find that the different isomers are likely to adopt an orientation that is perpendicular to the surface. While 4-ATP forms the densest monolayer, 2-ATP probably interacts with the gold surface with both the amino and the mercapto groups. Moreover, STM images indicate the partial formation of more than a monolayer. This is supported by XPS measurements and electrochem. and can be attributed to the SAM modification soln., i.e. sulfuric acid, which allows the formation of sulfate-bridged ATP bilayers. The chem. and phys. characteristics of the interfaces are governed by the different organization as well as by the individual chem. properties of each isomer. [on SciFinder(R)]


CAPLUS AN 2000:891141(Journal)