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O: Oberflächenphysik

O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)

O 14.60: Poster

Montag, 8. März 2004, 18:00–21:00, Bereich C

Intermolecular Interactions in Thin Films of SubphthalocyaninatoChloroBoron (SubPc) and its Fluorinated Derivative (F12SubPc) — •Christine Mattheus¹, Dieter Wöhrle², William Durfee³, and Derck Schlettwein¹ — ¹Physical Chemistry 1, University of Oldenburg, Germany — ²Institute of Organic and Macromolecular Chemistry, University of Bremen, Germany — ³Department of Chemistry, Buffalo State College, NY, USA

Thin films of unsusbstituted SubPc and perfluorinated F12SubPc were prepared by PVD on various single crystalline and amorphous insulators. The intermolecular coupling was studied by in situ UV- vis absorption spectroscopy, the morphology was analysed by atomic force microscopy (AFM) and the structure of the films was studied by X-ray diffraction (XRD). For SubPc, a rather small influence of the substrate structure was observed, whereas F12SubPc showed significantly different spectra on KBr and KCl when compared to NaCl, mica or glass. For both materials, spectral characteristics were observed that point at changing interactions of the molecules in the solid films. In the AFM analysis larger and more oriented grains were found for films grown at elevated temperature. These films were characterized by well- defined chromophores coupling as seen in UV-vis spectroscopy and were crystalline as observed in XRD. Relative intensities in XRD were used to discuss a preferential orientation of crystals and hence the molecules relative to the surface.