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Materials Science and Engineering: C, 8-9 (0), 431 - 435, 1999.
Copyright © 1999 Elsevier, NL

Chemical properties of hydrogen-bonded organic bilayers fabricated via self-assembly of COOH-functionalised oligophenylthiols on Au substrates

Hans-Jörg Himmel,1 Andreas Terfort,2 Ralf Arnold,1 and Christof Wöll*1

1 Ruhr-Universität Bochum, Physikalische Chemie I, Universitätsstr. 150, D-44801 Bochum, Germany, and
2 Universität Hamburg, Institut für Anorganische und Angewandte Chemie, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany

Received November 26, 2001

In Final Form: February 4, 2002


Here we present an investigation of chemical reaction induced by exposing organic, hydrogen bonded films, prepared from COOH-terminated oligophenylmeolecules on Au to solutions of different reactants. Our study includes reactions with acids (trifluoriacetic acid, TFA) and metal ions (potassium (K+)- and copper (Cu2+)-ions). On the basis of XP measurements the film thickness and the elemantal ratios of the elements involved in the process have been quantified. Our results reveal that treatment of the bilayers with trifluoroacetic acid results in the removal of the second layer and the formation of highly oriented, COOH-terminated monolayers. While the immersion of the bilayers in solutions containing Cu2+-ions leads to the removal of the second layer and the formation of a Cu2+-terminated monolayer surface, potassion ions are incorporated in the bilayers by immersion into an ethanolic solution of potassion hydroxide. The reasons of this differences are related to the different coordination spheres of the ions and their compatibility with the structure of the self-assembled film.

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