1. Concentration-dependent supramolecular patterns of C3 and C2 symmetric molecules at the solid/liquid interface.
- Author
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Garah, Mohamed El, Cook, Timothy R., Sepehrpour, Hajar, Ciesielski, Artur, Stang, Peter J., and Samorì, Paolo
- Subjects
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GRAPHITE , *BIOLOGICAL interfaces , *MOLECULAR structure , *HYDROGEN bonding , *SCANNING tunneling microscopy - Abstract
Here we report on a scanning tunnelling microscopy (STM) investigation on the self-assembly of C 3 - and C 2 -symmetric molecules at the solution/graphite interface. 1,3,5-tris(( E )-2-(pyridin-4-yl)vinyl)benzene and 1,1,2,2-tetrakis(4-(pyridin-4-yl)phenyl)ethane are used as model systems. These molecules displayed a concentration dependent self-assembly behaviour on graphite, resulting in highly ordered supramolecular structures, which are stabilized jointly by van der Waals substrate-adsorbate interactions and in-plane intermolecular H-bonding. Denser packing is obtained when applying a relatively high concentration solution to the basal plane of the surface whereas a less dense porous network is observed upon lowering the concentration. We show that the molecular conformation does not influence the stability of the self-assembly and a twisted molecule can pack into dense and porous architectures under the concentration effect. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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