Müllegger Stefan, Hänel Kathrin, Strunskus Thomas, Wöll Christof, Winkler Adolf
Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
Chemphyschem. 2006 Dec 11;7(12):2552-8. doi: 10.1002/cphc.200600353.
Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy has been applied to reveal the molecular arrangement of ultrathin oligophenyl films [p-quaterphenyl (4P) and p-hexaphenyl (6P)] on Au(111). In the half-monolayer films the molecules lie flat on the surface but still have a considerable inter-ring twist of 30 degrees -40 degrees , similar to the gas-phase conformation. In the saturated monolayer film the second half of the molecules is side-tilted by an angle of less than 66 degrees with respect to the surface. This arrangement is already similar to that in bulk net planes of thicker films parallel to the surface, that is, the 4P(211) and 6P(21-3) planes, respectively.
