Exploring the hydrogen bond kinetics of methanol–water solutions using Raman scattering

Literature Information

Publication Date 2020-10-19
DOI 10.1039/D0CP04295A
Impact Factor 3.676
Authors

Fabing Li, Ying Wang, Zhiwei Men, Chenglin Sun


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Abstract

Stimulated Raman scattering (SRS) and spontaneous Raman spectra are both used here to study the hydrogen bond (HB) structure and kinetics of methanol (MeOH)–water mixtures in different volume ratios. We have found that when the volume fraction of MeOH ranges from 0 to 0.27, the HB structure of water molecules is enhanced, originating from the cooperation of the hydroxyl-enhanced HBs in liquid water and the formation of an ice-like structure around the methyl groups. However, when the volume fraction of MeOH goes beyond 0.27, the main Raman peak of water becomes very weak and even disappeared, which reveals that the HB structure of liquid water is weakened. This weakening can be attributed to the H–H repulsion introduced by MeOH salvation derives. Furthermore, some HBs among water molecules are destroyed at a high MeOH volume fraction (0.7) based on the change of C–H vibrations.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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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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