The influence of molecular local order on the non-coincidence Raman spectra of methanol in liquid mixtures

We have analysed the observed Raman non-coincidence shifts (NCE), Δ= ν aniso - ν iso, for the ν(C-0) band of methanol in binary mixtures with the solvents; water, acetonitrile and carbon tetrachloride. For polar solvents the data are consistent with a reduction in the contribution of the repulsive i...

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Bibliographic Details
Published in:Journal of molecular liquids 1999-08, Vol.81 (3), p.213-223
Main Authors: Kecki, Z, Sokolowska, A, Yarwood, J
Format: Article
Language:English
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Summary:We have analysed the observed Raman non-coincidence shifts (NCE), Δ= ν aniso - ν iso, for the ν(C-0) band of methanol in binary mixtures with the solvents; water, acetonitrile and carbon tetrachloride. For polar solvents the data are consistent with a reduction in the contribution of the repulsive intermolecular potential which we believe gives rise to -ve value of Δ. Over the concentration range studies (0 – 0.8 mf of solvent) Δ decreases monotonically to zero reflecting the breaking of the CH 3OH network structure (as found using neutron, X-ray and simulation techniques). For the non-polar solvent, (CCl 4) the opposite trend is found, implying that CH 3OH cluster ‘enhancement’ occurs for CH 3OH/CCl 4 mixtures at high CH 3OH concentrations.
ISSN:0167-7322
1873-3166
DOI:10.1016/S0167-7322(99)00052-5