Concentration-dependent supramolecular patterns of C3 and C2 symmetric molecules at the solid/liquid interface

EL GARAH, Mohamed, COOK, Timothy R., SEPEHRPOUR, Hajar, CIESIELSKI, Artur, STANG, Peter J. et SAMORI, Paolo, 2018. Concentration-dependent supramolecular patterns of C3 and C2 symmetric molecules at the solid/liquid interface. Colloids and Surfaces B: Biointerfaces [en ligne]. 1 août 2018. Vol. 168, pp. 211-216. [Consultésans date]. DOI 10.1016/j.colsurfb.2017.11.065. Consulté de : https://www.sciencedirect.com/science/article/pii/S0927776517308202?via%3DihubHere we report on a scanning tunnelling microscopy (STM) investigation on the self-assembly of C3- and C2-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.1. .