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Theme 2 colloquium: "Low-dimensional molecular assemblies on metallic vs. graphitic surfaces " (Lecture)

Tuesday 12 February 2019Add to my calendar
from 16:00
Prof. Meike Stöhr (Zernike Institute for Advanced Materials, University of Groningen)

prof. Meike StöhrThe interest in studying organic nanostructures on surfaces emerges from their prospective usage as nanoscale functional materials in applications ranging from electronics to spintronics and catalysis. By making use of molecular recognition processes based on non-covalent interactions, well-ordered 1D and 2D molecular structures can be formed on surfaces. However, since the underlying interactions for such structures can be rather weak, on-surface covalent coupling has emerged as a viable alternative for obtaining structures with improved stability and conductivity. An improved understanding of the interplay of intermolecular and molecule-substrate interactions holds the prospect of being able to deliberately tune the functional properties of the organic nanostructures.

In my presentation, I will on the one side discuss the influence of the substrate on molecular self-assembly. For both 1,3,5-benzenetribenzoic acid [1] and parahexaphenyl-dicarbonitrile [2] we compared the adsorption on Cu(111) and graphene and concluded that a single graphene layer suffices to considerably alter the interplay of intermolecular and molecule substrate interactions. On the other side, I will show two examples where we made use of on-surface synthesis (Ullmann-type coupling in particular) for the formation of covalently coupled molecular structures [3].

[1] J. Li et al., J. Phys. Chem. C 120 (2016) 18093.
[2] N. Schmidt et al., Chem. Eur. J., accepted; J. Li et al., submitted.
[3] Q. Sun et al., Angew. Chem. Int. Ed. 56 (2017) 12165; B.V. Tran et al., Nanoscale 9 (2017) 18305.

dr. Peter Korevaar & dr. Evan Spruijt