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

By M. (Mohamed) El Garah, Timothy R. Cook, H. (Hajar) Sepehrpour, A. (Artur) Ciesielski, Peter J. Stang and P. (Paolo) Samori

Abstract

Here 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

Topics: Chimie/Matériaux
Publisher: 'Elsevier BV'
Year: 2017
DOI identifier: 10.1016/j.colsurfb.2017.11.065
OAI identifier: oai:univoak.eu:islandora_70108
Provided by: univOAK

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