Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: Nanostructures at Surfaces: Molecular Systems I
O 91.10: Talk
Thursday, March 23, 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.