Abstract
A rigid organic compound possessing two photoreactive groups, N,N′-di(2-anthryl)pyromellitimide (DAPI), has been synthesized, and the structure of its thin films formed on alkali halides by vacuum evaporation was investigated by transmission electron microscopy, electron diffraction, and atomic force microscopy. The thin films of DAPI were composed of many rod-like crystallites with preferred orientation of the longer axis in the direction parallel or perpendicular to the [100] steps of the alkali halides. The electron diffraction pattern showed a four fold symmetry. The spacings of electron diffraction spots coincided with those observed for a bulk crystal by the wide angle X-ray diffraction measurement. The obtained results revealed that the heterogeneous nucleation at the steps plays an important role in the observed epitaxial growth for the present DAPI thin films.
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