Blunt, MatthewRussell, JamesGiménez López, María del CarmenGarrahan, JuanXiang, LinSchröder, MartinChampness, NeilBeton, Peter2024-02-012024-02-012008Matthew O. Blunt et al. ,Random Tiling and Topological Defects in a Two-Dimensional Molecular Network.Science322,1077-1081(2008).DOI:10.1126/science.11633380036-8075http://hdl.handle.net/10347/32173This is the Accepted Manuscript of the following article: Blunt, M.O., Russell, J.C., Gimenez Lopez, M.C., Garrahan, J.P., Lin, X., Schróder, M., Champness, N.R., Beton, P.H., Science, 2008, DOI:10.1126/science.116333A molecular network that exhibits critical correlations in the spatial order that is characteristic of a random, entropically stabilized, rhombus tiling is described. Specifically, we report a random tiling formed in a twodimensional molecular network of p-terphenyl-3,5,3′,5′-tetracarboxylic acid adsorbed on graphite. The network is stabilized by hexagonal junctions of three, four, five, or six molecules and may be mapped onto a rhombus tiling in which an ordered array of vertices is embedded within a nonperiodic framework with spatial fluctuations in a local order characteristic of an entropically stabilized phase. We identified a topological defect that can propagate through the network, giving rise to a local reordering of molecular tiles and thus to transitions between quasi-degenerate local minima of a complex energy landscape. We draw parallels between the molecular tiling and dynamically arrested systems, such as glassesengAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Hydrogen bondingsCarboxylic acidMolecular network2206 Física molecular230314 Hidrogenojournal article10.1126/science.11633381095-9203open access