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Issue 2, 2012
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Coverage-dependent adsorption geometry of octithiophene on Au(111)

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The adsorption behavior of α-octithiophene (8T) on the Au(111) surface as a function of 8T coverage has been studied with low-temperature scanning tunneling microscopy, high resolution electron energy loss spectroscopy as well as with angle-resolved two-photon photoemission and ultraviolet photoemission spectroscopy. In the sub-monolayer regime 8T adopts a flat-lying adsorption geometry. Upon reaching the monolayer coverage the orientation of 8T molecules changes towards a tilted configuration, with the long molecular axis parallel to the surface plane, facilitating attractive intermolecular π–π-interactions. The photoemission intensity from the highest occupied molecular orbitals (HOMO and HOMO − 1) possesses a strong dependence on the adsorption geometry due to the direction of the involved transition dipole moment for the respective photoemission process. The change in molecular orientation as a function of coverage in the first molecular layer mirrors the delicate balance between intermolecular and molecule/substrate interactions. Fine tuning of these interactions opens up the possibility to control the molecular structure and accordingly the desirable functionality.

Graphical abstract: Coverage-dependent adsorption geometry of octithiophene on Au(111)

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Article information

09 Sep 2011
26 Oct 2011
First published
16 Nov 2011

Phys. Chem. Chem. Phys., 2012,14, 691-696
Article type

Coverage-dependent adsorption geometry of octithiophene on Au(111)

E. Varene, L. Bogner, S. Meyer, Y. Pennec and P. Tegeder, Phys. Chem. Chem. Phys., 2012, 14, 691
DOI: 10.1039/C1CP22875G

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