title: Coverage dependent disorder-order transition of 2H-tetraphenylporphyrin on Cu(111).
abstract: In this study, we investigate the peculiar coverage dependent supramolecular arrangement of 2H-tetraphenylporhpyrin (2HTPP) on Cu(111) with scanning tunneling microscopy at room-temperature. At low coverage, "slow" diffusion of individual 2HTPP molecules along the close-packed atomic rows of the substrate is observed, and no supramolecular ordering occurs. However, at higher coverage, the formation of ordered, checkerboard-like domains is found, with two molecules per unit cell at different distances from the surface. This behavior is attributed to a complex interplay of site specific molecule-substrate interaction, mainly the strong interaction between the iminic N atoms and Cu substrate atoms, with intermolecular T-type and π-π interactions.
authors: Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Erlangen, Germany.
authors: Michael
authors: M
authors: Stark
authors: Stefanie
authors: S
authors: Ditze
authors: Martin
authors: M
authors: Drost
authors: Florian
authors: F
authors: Buchner
authors: Hans-Peter
authors: HP
authors: Steinrück
authors: Hubertus
authors: H
authors: Marbach