Measuring acetic acid dimer modes by ultrafast time-domain Raman spectroscopy

Literature Information

Publication Date 2011-05-31
DOI 10.1039/C1CP20990F
Impact Factor 3.676
Authors

Ismael A. Heisler, Kamila Mazur, Sayuri Yamaguchi, Stephen R. Meech


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Abstract

Acetic acid is capable of forming strong multiple hydrogen bonds and therefore different dimeric H-bonded structures in neat liquid phase and in solutions. The low frequency Raman spectra of acetic acid (neat, in aqueous solution and as a function of temperature) were obtained by ultrafast time and polarization resolved optical Kerr effect (OKE) measurements. Isotropic OKE measurements clearly reveal a specific totally symmetric mode related to the dimeric structure H-bond stretching mode. The effects of isotope substitution, water dilution and temperature on this mode were investigated. These results together with anisotropic OKE measurements and density functional theory calculations for a number of possible dimers provide strong evidence for the cyclic dimer structure being the main structure in liquid phase persisting down to acetic acid concentrations of 10 M. Some information about the dimer structure and concentration dependence was inferred.

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DOI: 10.1039/C2GC90046G

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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