Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.25: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Intermolecular Interactions in Thin Films of Subphthalocyanines — •Christine Mattheus¹, Wilfried Michaelis^1,2, Dieter Wöhrle², and Derck Schlettwein¹ — ¹Physical Chemistry 1, University of Oldenburg, Germany — ²Institute of Organic and Macromolecular Chemistry, University of Bremen, Germany

Thin films of SubphthalocyaninatoChloroBoron (SubPc) and its Fluorinated Derivative (F12SubPc) have been prepared by physical vapour deposition on NaCl, KBr, mica and glass. The intermolecular coupling was studied in situ by UV- vis absorption spectroscopy and the structure of the films was studied by X- ray diffraction (XRD). During deposition of SubPc at 298 K optical spectra were obtained that were quite similar to spectra of the molecules in solution indicating negligible specific intermolecular coupling in the films. After heating or during deposition on heated substrates a spectral change was observed speaking for an increased coupling in the films. The increased coupling of molecules in annealed films led to an X- ray diffraction pattern of the films consistent with the bulk crystal structure. The relative intensity in XRD shows a preferential orientation of crystals with the ab-plane parallel to the surface caused by an orientation of the molecules with their B-Cl axis perpendicular to the surface and with their aromatic cone parallel to it. As an additional parameter, the influence of fluorination on the growth characteristics was also studied.