Elementary Structural Motifs in a Random Network of Cytosine Adsorbed on a Gold(111) Surface
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) surfa...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2008-01, Vol.319 (5861), p.312-315 |
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| creator | Otero, Roberto Lukas, Maya Kelly, Ross E.A Xu, Wei Lægsgaard, Erik Stensgaard, Ivan Kantorovich, Lev N Besenbacher, Flemming |
| description | 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. |
| doi_str_mv | 10.1126/science.1150532 |
| format | Article |
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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. 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| ispartof | Science (American Association for the Advancement of Science), 2008-01, Vol.319 (5861), p.312-315 |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Binding sites Biological and medical sciences Chemistry Dimers Exact sciences and technology Fundamental and applied biological sciences. Psychology Gas-liquid interface and liquid-liquid interface General and physical chemistry Glass Gold Hydrogen Hydrogen bonds Materials science Microscopy Molecular biophysics Molecular interactions Molecular structure Molecules Organic chemistry Periodicity Room temperature Surface physical chemistry Surface properties. Adsorption Temperature Theory |
| title | Elementary Structural Motifs in a Random Network of Cytosine Adsorbed on a Gold(111) Surface |
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