Molecular orientation of small carboxylates at the water–air interface

Literature Information

Publication Date 2022-04-04
DOI 10.1039/D1CP05471F
Impact Factor 3.676
Authors

Carolyn J. Moll, Alexander A. Korotkevich, Jan Versluis, Huib J. Bakker


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Abstract

We study the properties of formate (HCOO−) and acetate (CH3COO−) ions at the surface of water using heterodyne-detected vibrational sum-frequency generation (HD-VSFG) spectroscopy. For both ions we observe a response of the symmetric (νs) and antisymmetric (νas) vibrations of the carboxylate group. The spectra further show that for both formate and acetate the carboxylate group is oriented toward the bulk, with a higher degree of orientation for acetate than for formate. We found that increasing the formate and acetate bulk concentrations up to 4.5 m does not change the orientation of the formate and acetate ions at the surface and does not lead to saturation of the surface density of ions.

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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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