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Structures and orientations of cobalt phthalocyanine adsorbed on Sb(111).

The structures and orientations of cobalt phthalocyanine (CoPc) adsorbed on Sb(111) were investigated by low-temperature scanning tunneling microscope. We found that at the initial coverage molecular domains formed both on the terraces and at the vicinity of step edges that were saturated by molecular chains in advance. With the increasing of molecular coverage, the alternately arranged molecular rows of CoPc adsorbed on the bridge sites of Sb(111) and the orientations of them were rotated by 14° ± 2° with respect to the [-101] direction. At the coverage above one monolayer, the molecules of the second layer were assembled along the directions of the underlying molecular rows and showed similar configurations. Consequently, the second-layer CoPc molecules interacted with neighboring molecules via π orbitals, resulting in the observation of overlapped molecular orbitals.