BUCHNER, R and YARWOOD, J (1991) FAR-INFRARED STUDIES OF THE MOLECULAR-DYNAMICS AND INTERACTIONS IN N-METHYL FORMIDE. JOURNAL OF MOLECULAR LIQUIDS, 49. pp. 141-154. ISSN 0167-7322,
Full text not available from this repository.Abstract
The effect of dilution in carbon tetrachloride on the far-infrared spectra (5-150 cm-1) of N-methyl formide has been investigated over the whole miscibility range. The data have been combined with (literature) microwave data to enable total dipole density correlation functions to be computed. These emphasise any differences in short time dynamics which occur due to the breaking of hydrogen-bonds with dilution. The data have been fitted to current models for libration in a solvent "cage". The most obvious reflection of the changing intermolecular potential is a large decrease in the average intermolecular torques and a corresponding change of shape of the absorption spectrum in the region of interest - especially at lower frequencies. The rate of fluctuation of the intermolecular 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 dilution in a non-polar solvent since co-operatively is extremely dependent on aggregate concentration. The contrasting behaviour of NMF and DMF (which cannot form hydrogen-bonded multimers in solution) is emphasised and explained.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HYDROGEN-BONDED COMPLEXES; ABSORPTION-BAND SHAPE; VIBRATIONAL-RELAXATION; STRETCHING BANDS; RAMAN-SPECTRA; IR; PROFILES; LIQUIDS; FORMAMIDE; SIMULATION; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54871 |
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