Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 47: Organic films IV
O 47.6: Talk
Friday, March 31, 2006, 12:30–12:45, PHY C213
STM and LEED study on the Influence of Different Substituents on the Growth of Quaterrylene Derivatives on Gold. — •Christian Wagner1, Robert Franke1, Sebastian Franke1, Thomas Dienel1, Stefan Mannsfeld2, and Torsten Fritz1 — 1Institut für Angewandte Photophysik; TU-Dresden; George-Bähr-Straße 1; 01069 Dresden — 2Department of Chemical Engineering; Stanford University; 381 North South Mall; Stanford, CA 94305-5025
The possibility to tailor and control organic molecules for special purposes opens a new field of possible applications. There is a general interest in the question how even minor modifications e.g. different substituents change the behavior of a class of molecules. In highly ordered monolayers, the influence of the substituents can be studied in a well defined environment. As perylene derivatives [1] have already been studied intensively, we have now grown highly ordered monolayers of the larger IR absorbing quaterrylene derivatives, quaterrylene (QT) and quaterrylenebisdicarboximide (QTCDI) on Au in UHV. The structure of QT has been studied by STM and LEED and fits nicely to state-of-the-art potential calculations [2] for the growth of large QT domains on gold. Due to the presence of imide groups the structure of QTCDI differs strongly from QT. Three different phases have been found which can be explained by the formation of hydrogen bonds. The capability of the potential calculations is demonstrated as all three phases are predicted.
[1] H. Proehl, T. Dienel, R. Nitsche und T. Fritz, PRL. 93 (2004) 097403 [2] S.C.B. Mannsfeld and T. Fritz, PRB 93 (2004) 075416 & PRB 71 (2005) 235405