Elementary structural motifs in a random network of cytosine adsorbed on a gold(111) surface

被引：156

作者：

Otero, Roberto ^{[1
,2
]}

Lukas, Maya ^{[1
,2
]}

Kelly, Ross E. A. ^{[3
]}

Xu, Wei ^{[1
,2
]}

Laegsgaard, Erik ^{[1
,2
]}

Stensgaard, Ivan ^{[1
,2
]}

Kantorovich, Lev N. ^{[3
]}

Besenbacher, Flemming ^{[1
,2
]}

机构：

[1] Aarhus Univ, Ctr DNA Nanotechnol, Interdisciplinary Nanosci Ctr, DK-8000 Aarhus C, Denmark

[2] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[3] Kings Coll London, Sch Phys Sci & Engn, Dept Phys, London WC2R 2LS, England

来源：

SCIENCE | 2008年 / 319卷 / 5861期

关键词：

D O I：

10.1126/science.1150532

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：312 / 315

页数：4

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