Web Release Date: December 12,
Two-Dimensional Supramolecular Nanopatterns Formed by the Coadsorption of Guanine and Uracil at the Liquid/Solid Interface
and
Interdisciplinary Nanoscience Center (iNANO), Centre for DNA Nanotechnology (CDNA), and Department of Physics and Astronomy, University of Aarhus, DK-8000 Arhus C, Denmark, Department of Physics, School of Physical Sciences and Engineering, King's College London, Strand, London, U.K. WC2R 2LS, and Department of Physics and Astronomy, University College London, Gower Street, London, U.K. WC1E 6BT
Received September 10, 2007
Abstract:
A novel supramolecular nanostructure formed by the coadsorption of the complementary nucleobases guanine (G) and uracil (U) at the liquid (1-octanol solvent)/solid (graphite) interface is revealed by scanning tunneling microscopy (STM). The GU supramolecular structure is distinctly different from the structures observed by STM when the individual nucleobases (NB) are adsorbed on graphite in the control experiments. Using a systematic methodology and ab initio density functional theory (DFT), an atomistic structural model is proposed for the supramolecular coadsorbed GU structure, which consists of a periodic repetition of cyclic units based on the strongest GU base pairing.
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