Rubidium Doped Metal-Free Phthalocyanine Monolayer Structures on Au(111)

Abstract

Scanning tunneling microscopy (STM) studies of monolayer of metal-free phthalocyanine (H2Pc) adsorbed on Au(111) have shown ordered arrangement of the molecules on the surface. Evaporation of H2Pc onto the Au(111) surface and post annealing of the sample to 670 K results in a densely packed structure of the molecules. The monolayer is characterized by molecules adsorbed with the molecular plane parallel to the substrate surface in a square adsorption unit cell. Furthermore, the high resolution images revealed the orientation of individual molecules. The H2Pc/Au(111) system has also been doped by rubidum and compared to the undoped layers. The Rb affects the molecular adsorption geometry, and a hexagonal unit cell is found for the coadsorption of H2Pc and Rb. Upon doping, highly ordered Rb-induced protrusions are observed at the benzene site of adsorbed molecules.

Surface chemistry of porphyrins and phthalocyanines

“…This commensurate phase, which was observed at medium coverages and low temperature, had the same unit cell as the commensurate phase of CuPc/Ag(1 1 1) (see this section above). Adsorption of 2HPc on the more weakly interacting Au(1 1 1) surface and post-annealing to 670 K resulted in the formation of a densely packed structure with a square unit cell, which changed to a hexagonal unit cell upon co-adsorption of Rb [289]. Highlevel van der Waals corrected DFT calculations for the system 2HPc/Au(1 1 1) were reported by Lüder et al [290].…”

Site-dependent charge transfer at the Pt(111)-ZnPc interface and the effect of iodine

“…1. A ML refers to the coverage, in which tightly-packed, flatlying molecules would cover the entire surface [3]; the coverage for a TF here is about 10 MLs. The XAS measurement angles are: θ = 0 • (normal incidence), θ = 40 • and θ = 80 • (grazing incidence), where θ is the angle between the electric-field vector and the surface plane.…”

Experimental and theoretical study of electronic structure of lutetium bi-phthalocyanine

“…Despite a very large amount of work devoted to the elucidation of molecular interaction of Pc molecules on metal surfaces, 7,8 only few studies have focused on the semiconducting surfaces 9,10 and even less on double-decker Pc's on these technologically relevant surfaces. 11,12 On most metallic surfaces, Pc molecules are known to lie flat, whereas the molecular architectures are various on semiconducting substrates.…”