Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 168, Issue -, Pages 211-216Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2017.11.065
Keywords
STM; Concentration dependent; Solid/liquid; HOPG; Symmetry
Funding
- European Community through the European Research Council project SUPRAFUNCTION [GA-257305]
- Agence Nationale de la Recherche through the Labex project CSC within the Investissement d'Avenir program [ANR-10-LABX-0026CSC, ANR-10-IDEX-0002-02]
- International Center for Frontier Research in Chemistry (icFRC)
- NSF [CHE 0820955]
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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. (C) 2017 Elsevier B.V. All rights reserved.
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