Article Dans Une Revue Colloids and Surfaces B: Biointerfaces Année : 2017

Concentration-dependent supramolecular patterns of C$_3$ and C$_2$ symmetric molecules at the solid/liquid interface

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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.

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hal-04679516 , version 1 (27-08-2024)

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Mohamed El Garah, Timothy R. Cook, Hajar Sepehrpour, Artur Ciesielski, Peter J. Stang, et al.. Concentration-dependent supramolecular patterns of C$_3$ and C$_2$ symmetric molecules at the solid/liquid interface. Colloids and Surfaces B: Biointerfaces, 2017, 168, pp.211-216. ⟨10.1016/j.colsurfb.2017.11.065⟩. ⟨hal-04679516⟩
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