Influence of argon and D2 tagging on the hydrogen bond network in Cs+(H2O)3; kinetic trapping below 40 K

Literature Information

Publication Date 2018-10-30
DOI 10.1039/C8CP06020G
Impact Factor 3.676
Authors

Tim K. Esser, Harald Knorke, Flavio Siro-Brigiano, Daria Ruth Galimberti, Knut R. Asmis, Marie-Pierre Gaigeot, James M. Lisy


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Abstract

The influence of enthalpic and entropic effects as well as of kinetic trapping processes on the structure of Ar/D2-tagged Cs+(H2O)3 clusters is studied by temperature-dependent infrared photodissociation spectroscopy combined with harmonic vibrational spectra calculations and anharmonic free energy profiles from finite temperature metadynamics molecular dynamics simulations. Each tag favors a different hydrogen bond network of water molecules, with Ar-tagging (vs. D2-tagging) of Cs+(H2O)3 leading to the lower energy conformation. The relative population of these conformers can be tuned over a temperature range of 12 to 21 K. The formation mechanisms of these tagged clusters can be deduced from the free energy profiles. This investigation demonstrates that a variety of factors, both thermodynamic and kinetic, play a role in the structure of flexible molecular species, even at cryogenic temperatures.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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