Raman spectroscopic study on acetic acid clusters in aqueous solutions: Dominance of acid-acid association producing microphases

Nobuyuki Nishi, Takakazu Nakabayashi, Kentaroh Kosugi

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63 Citations (Scopus)

Abstract

The C=O stretching vibration band of acetic acid showed a high-frequency shift from 1665 to 1715/cm by adding water into liquid acetic acid, indicating that the hydrogen bond of the C=O group of acetic acid was not as strong as those in liquid acetic acid or in CCl4 solution (in which the band appeared at 1668/cm). The increase of acetic acid in water decreased the intensity of the hydrogen-bonded O-H stretching Raman band of water at 3200/cm. Low-frequency R(v) spectra of acetic acid/water binary solutions were re-examined with new experimental data and ab initio molecular orbital analysis of intermolecular vibrational modes. The R(v) spectrum of the aqueous mixture at xA = 0.5 had a very close resemblance to that of the acetic acid/methanol mixture with xA = 0.5, indicating that the molecular complexes responsible for the Raman spectra were acetic acid clusters.

Original languageEnglish
Pages (from-to)10851-10858
Number of pages8
JournalJournal of Physical Chemistry A
Volume103
Issue number50
DOIs
Publication statusPublished - 1999 Dec 16
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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