Two-dimensional network stability of nucleobases and amino acids on graphite under ambient conditions: adenine, l-serine and l-tyrosine

文献情報

出版日 2010-03-09

DOI 10.1039/B924098E

インパクトファクター 3.676

著者

Ilko Bald, Sigrid Weigelt, Xiaojing Ma, Pengyang Xie, Ramesh Subramani, Mingdong Dong, Chen Wang, Wael Mamdouh, Jianguo Wang, Flemming Besenbacher

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要旨

We have investigated the stability of two-dimensional self-assembled molecular networks formed upon co-adsorption of the DNA base, adenine, with each of the amino acids, L-serine and L-tyrosine, on a highly oriented pyrolytic graphite (HOPG) surface by drop-casting from a water solution. L-serine and L-tyrosine were chosen as model systems due to their different interaction with the solvent molecules and the graphite substrate, which is reflected in a high and low solubility in water, respectively, compared with adenine. Combined scanning tunneling microscopy (STM) measurements and density functional theory (DFT) calculations show that the self-assembly process is mainly driven by the formation of strong adenine–adenine hydrogen bonds. We find that pure adenine networks are energetically more stable than networks built up of either pure L-serine, pure L-tyrosine or combinations of adenine with L-serine or L-tyrosine, and that only pure adenine networks are stable enough to be observable by STM under ambient conditions.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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