An experimental and theoretical study of adenine adsorption on Au(111)

Literature Information

Publication Date 2018-01-19
DOI 10.1039/C7CP08102B
Impact Factor 3.676
Authors

Robert G. Acres, Xun Cheng, Sofiia Bercha, Tomáš Skála, Vladimír Matolín, Ye Xu, Kevin C. Prince, Nataliya Tsud


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Abstract

A model study of adenine adsorption on the Au(111) surface is reported for molecular adlayers prepared by evaporation in vacuum and deposition from saturated aqueous solution. The electronic structure and adsorption geometry of the molecular films were studied experimentally by X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure spectroscopy. Adsorption models are proposed for the adlayers arising from the different preparation methods. Density functional theory calculations were used to examine both parallel and upright adenine adsorption geometries, supply additional information on the bond strength, and identify which atom is involved in bonding to Au(111). In the case of deposition in vacuum, the adenine molecule is bound via van der Waals forces to Au(111) with the molecular plane parallel to the surface, consistent with the published scanning tunneling microscopy data on this system. The most stable parallel adenine configuration was found to have an adsorption energy of ca. −1.1 eV using the optB86b-vdW functional. For adenine deposition from aqueous solution, the adlayer is disordered, with molecules in an upright geometry, and with an adsorption energy of ca. −1.0 eV, coordinated via the imino N3 nitrogen atom. The present study contributes to the substantial literature of model studies of adenine on Au(111), complementing the existing knowledge with information on electronic structure, bonding geometry and adsorption energy of this system.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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