Abstract
Adsorption of cobalt(II) hexadecafluoro-phthalocyanine (F16CoPc) onto a silver (110) surface, prepared by organic molecular beam epitaxy (OMBE) is investigated using ultra high vacuum scanning tunneling microscopy (UHV STM) operating at 40 K. The asymmetry of the metal substrate is found to act as a template for the organic adlayer that grows preferentially along the [110] crystallographic axis leading to the formation of commensurate structures with well-defined pinning centers. A line-to-line epitaxy is observed where the difference in interpinning line spacing superimposes the development of two different structures: oblique and square. Structural models are proposed and discussed for both adsorbate lattices where the first one is strongly sustained by the molecular self-assembly at the defect proximity and especially at the domain boundaries where a mirror structure is induced.
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