Buchner, Richard and Yarwood, J. (1991) Far-infrared studies of the molecular dynamics and interactions in N-methyl formamide. Journal of Molecular Liquids 49, pp. 141-154.
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The effect of diln. in carbon tetrachloride on the far-IR spectra (5-150 cm-1) of N-Me formamide (NMF) was investigated over the whole miscibility range. The data were combined with (literature) microwave data to enable total dipole d. correlation functions to be computed. These emphasize any differences in short time dynamics which occur due to the breaking of hydrogen-bonds with diln. The data were fitted to current models for libration in a solvent "cage". The most obvious reflection of the changing intermol. potential is a large decrease in the av. intermol. torques and a corresponding change of shape of the absorption spectrum in the region of interest - esp. at lower frequencies. The rate of fluctuation of the intermol. forces is changed only marginally so the short range (repulsive) part of the potential is not severely affected. The rate of diffusion (mostly a long ranged phenomenon) is very sensitive to diln. in a non-polar solvent since co-operatively is extremely dependent on aggregate concn. The contrasting behavior of NMF and DMF (which cannot form hydrogen-bonded multimers in soln.) is emphasized and explained.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||methyl formamide carbon tetrachloride liq structure|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||14 Jun 2012 05:28|
|Last Modified:||14 Jun 2012 05:28|