Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 91: Nanostructures at Surfaces: Molecular Systems I

O 91.10: Vortrag

Donnerstag, 23. März 2017, 12:45–13:00, REC/PHY C213

Metal coordination of tri-cyano-lophine on surfaces — •Bodong Zhang¹, Li Jiang¹, Yuanyuan Guo¹, Guillaume Médard², Simon Nadal², Bernhard Kuster², Francesco Allegretti¹, Joachim Reichert¹, Anthoula C. Papageorgiou¹, and Johannes V. Barth¹ — ¹Chair of Molecular Nanoscience & Chemical Physics of Interfaces (E20), Department of Physics, Technical University of Munich, DE — ²Chair of Proteomics and Bioanalytics, Technical University of Munich, DE

Lophine (2,4,5-triphenylimidazole) and its derivatives are of interest due to their large potential in chemiluminescence, fluorescence, and bioanalytics. To expand the application of lophine derivatives, they have been decorated with various functional groups, such as -H, -OH, -NO₂, -CN. Cyano groups are known to direct the fabrication of well defined metal coordination structures on surfaces through their interaction with metal atoms.

Here, we study the self-assembly and metal directed assembly of a tri-cyano-lophine on Ag(111), Au(111) and Cu(111) surfaces with scanning tunneling microscopy and X-ray photoelectron spectroscopy. On Ag and Au, well-ordered phases are stabilized by dipolar coupling and attractive interactions between cyano groups and phenyl rings. Addition of Co/Fe atoms leads to three-fold coordination of the terminal cyano groups. However, on Cu a different well-ordered phase forms, exhibiting hydrogen bonding of the C≡N⋯H-N type. Annealing leads to complete Cu adatom coordination of a terminal cyano group and a deprotonated N atom of the imidazole moiety.