A spectroscopic and ab initio study of the hydrogen peroxide–formic acid complex: hindering the internal motion of H2O2
文献信息
Leo Yuxiu Li, Nathan A. Seifert, Fan Xie, Matthias Heger, Yunjie Xu, Wolfgang Jäger
The microwave spectrum of the hydrogen-bonded hydrogen peroxide–formic acid complex was measured in the range from 4 to 17 GHz. Assignment of transitions and analyses of the spectrum were supported by ab initio wavefunction and density functional calculations. The detected conformer features a seven-membered hydrogen-bonded ring, in which the H-atom of one hydroxyl group of H2O2 and the O-atom of the other OH group are a hydrogen bond donor and acceptor, respectively, to the carboxyl group of formic acid. The rotational transitions show a tunnelling splitting, which is attributed to a wagging-like motion of the free H-atom of H2O2 from above to below the heavy atom plane of formic acid. Transitions between tunneling states are driven by the change in dipole moment accompanying this motion and were measured and analyzed. Ab initio analyses of the tunneling path reveal an asymmetric potential, which reflects the (transiently) chiral nature of the complex.
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Physical Chemistry Chemical Physics

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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