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

โœ Scribed by Z Kecki; A Sokolowska; J Yarwood

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
604 KB
Volume
81
Category
Article
ISSN
0167-7322

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โœฆ Synopsis

We have analysed the observed Raman non-coincidence shifts (NCE), A=v,,, -vise, for the v(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 A. Over the concentration range studies (0 2 0.8 mf of solvent) A decreases monotonically to zero reflecting the breaking of the CH,OH network structure (as found using neutron, X-ray and simulation techniques).

For the non-polar solvent, (Ccl,) the opposite trend is found, implying that CH,OH cluster 'enhancement' occurs for CH,OH/CC& mixtures at high CH,OH concentrations.

๐Ÿ“œ SIMILAR VOLUMES

Influence of local molecular order on no
Influence of local molecular order on non-coincidence in the Raman spectra of methanol in liquid mixtures. I โ€” non-polar solvent: carbon tetrachloride
โœ A. Sokolowska ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 56 KB ๐Ÿ‘ 2 views

The non-coincidence 1n = n anison iso was investigated in the Raman spectra of OH and CO bands of methanol diluted with carbon tetrachloride. Dilution with carbon tetrachloride brings about an increase in the negative non-coincidence of the CO band from -5 to -12 cm -1 and leaves it almost constant