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Abstract: The ordered adsorption structures of FePc on Cu (100) have been studied by scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. With the deposition rate beyond 0.5 ML per min, the FePc molecules are not deposited dispersedly but are deposited as molecular clusters. After the heat treatment (the temperature higher than 420K), the ordered organic structures of p(5×2) or p(2×5) are obtained. The ordered adsorption structures are in the tilt adsorption model. The FePc molecules in the different domains are aligned along the [011] or [] azimuth, respectively, the molecules are tilted. [Copyright &y& Elsevier]

Abstract: The monolayer structures of perylene adsorbed on Ag(110) surface were studied by combining scanning tunneling microscopy (STM) experiments and density functional theory (DFT) calculations. Several superstructures (i.e. loose and compact dimer structures, compact trimer structures) were observed. DFT calculation results show that the interaction between molecule and Ag substrate is weak, the intermolecular interaction is comparable with that between molecule and substrate. The organic self-assembly on metal surface results from the balance between intermolecular interaction and molecule–substrate interaction. On Ag(110) surface, the dimer-α structure was found to be more stable than other structures. [Copyright &y& Elsevier]