BOND STRETCHING AND DISTORTION IN LARGE ORGANIC MOLECULES ON Ag(111) DETERMINED BY SURFACE X-RAY DIFFRACTION

H. L. Meyerheim (), Th. Gloege, H. Maltor, M. Sokolowski, E. Umbach and P. Bäuerle
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H. L. Meyerheim: Institut für Kristallographic & Angewandte Minerlogie, Universität München, Theresienstraße 41, D-80333 München, Germany
Th. Gloege: Institut für Kristallographic & Angewandte Minerlogie, Universität München, Theresienstraße 41, D-80333 München, Germany
H. Maltor: Institut für Kristallographic & Angewandte Minerlogie, Universität München, Theresienstraße 41, D-80333 München, Germany
M. Sokolowski: Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
E. Umbach: Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
P. Bäuerle: Abteilung Organische Chemie II, Universität Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany

Surface Review and Letters (SRL), 1999, vol. 06, issue 05, 883-891

Abstract: The geometric structure of large organic molecules (end-capped quaterthiophene and 2-thiouracil) adsorbed on Ag(111) was analyzed in detail by surface X-ray diffraction. In both cases our data give direct evidence for significant stretching of the C–S and the C–C bonds by up to 0.16 Å and — in the case of EC4T — for a distortion of the thiophene rings. This is in contrast to the common belief that such molecules remain undistorted upon adsorption on a weakly interacting substrate. Our results provide the basis for a deeper understanding of large organic adsorbates and have important implications for a deeper insight into organic/inorganic interfaces in general.

Keywords: 61.10._i; 68.35.Bs (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1142/S0218625X99000949

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