Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 38: Adsorption V
O 38.11: Vortrag
Donnerstag, 30. März 2006, 17:30–17:45, TRE Phys
Porous Network Structure of Octacyno-metal free Phthalocyanine on HOPG Surface — •Thiruvancheril G. Gopakumar 1, Werner R. Thiel2, and Michael Hietschold1 — 1Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany. — 2Technical University Kaiserslautern, Department of Chemistry, Inorganic Chemistry, D-67663 Kaiserslautern, Germany.
The molecule-molecule interaction in the thin films of Phthalocyanine is the reversible weak van der Waals interaction. The use of functional groups in these molecular systems open the possibility to introduce strong molecule-molecule interaction and thereby a supra-molecular engineering. In this work we report the porous-network structure formation in Octacyno-metal free Phthalocyanine (H2Pc(CN)8) on HOPG surface. The molecular layers forming quadratic packing with one void per unit cell with an average void area of 2 nm2. Simple molecular dynamics calculation of different type of quadratic molecular unit cells shows the minimum energy structure has only one void per unit cell and show good agreement with the experiments. Beyond these porous structures there has been observed another phase of molecules, where highly close packed structures were found. Moreover typical point defects of filling of pore-structures are found which suggest this molecular layer to be used as a template for other organic molecules to elaborate the understanding of co-adsorption, site-selectivity, sensing etc. Finally we show that these defects can be induced and repaired by a tip-induced process.