Geometric correlations and infrared spectrum of adenine–uracilhydrogen bonds in CDCl3 solution
Literature Information
Yun-an Yan, Oliver Kühn
Hybrid QM/MM molecular dynamics simulations have been carried out for the Watson–Crick base pair of 9-ethyl-8-phenyladenine and 1-cyclohexyluracil in deuterochloroform solution at room temperature. Trajectories are analyzed paying special attention to the geometric correlations within the N–H⋯N and N–H⋯O hydrogen bonds in the base pair. Even though the two hydrogen bonds are only approximately linear and the heterocycles are tilted with respect to each other, hydrogen bond and N–H lengths follow a simple empirical correlation based on Pauling's valence bond order model. In order to describe the IR line shape of the two NH-stretching vibrations, the correlation between their fundamental transition frequencies and the hydrogen bond lengths is exploited. This facilitates efficient evaluation of the fluctuating transition frequencies along the QM/MM trajectory which allows the determination of the line shape function.
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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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