Journal
SCIENCE
Volume 319, Issue 5861, Pages 312-315Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1150532
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Nonsymmetrical organic molecules adsorbed on solid surfaces may assemble into random networks, thereby providing model systems for organic glasses that can be directly observed by scanning tunneling microscopy ( STM). We investigated the structure of a disordered cytosine network on a gold( 111) surface created by thermal quenching, to temperatures below 150 K, of the two- dimensional fluid present on the surface at room temperature. Comparison of STM images to density functional theory calculations allowed us to identify three elementary structural motifs ( zigzag filaments and five- and six- membered rings) that underlie the whole supramolecular random network. The identification of elementary structural motifs may provide a new framework for understanding medium- range order in amorphous and glassy systems.
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