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The disorder-longitudinal acoustic mode of oligo (ethylene glycol)-lithium trifluoromethane sulfonate solutions as studied by FT Raman spectroscopy |
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| Authors: | S. Shashkov S. Wartewig B. Sandner J. Tubke |
| Affiliation: | a Department of Physics, Martin-Luther-University, Halle-Wittenberg, Hoher Weg 7, D-06099, Halle/Saale, Germany b Department of Chemistry, Institute of Technical and Macromolecular Chemistry, Martin-Luther-University Halle-Wittenberg, Geusaer Str. 88, D-06217, Merseburg, Germany |
| Abstract: | This work presents the results of Fourier transform Raman spectroscopy investigations of the disorder-longitudinal acoustic mode (D-LAM) of oligo(ethylene glycol) dimethyl ether-lithium trifluoromethane sulfonate solutions in dependence on oligomer chain length, temperature and salt concentration. The peak position and the bandwidth of this mode depend on the long-range conformational disorder of oligo(ethylene glycol) chains. The addition of salt causes a marked increase of the long-range conformational disorder. The frequency shift of the D-LAM combined with changes in the asymmetric CH2 stretching bands indicate that the increasing long-range conformational disorder is connected with an increasing short-range conformational disorder of oligomer chains in a linear relationship. |
| Keywords: | Oligo(ethylene glycol) Lithium trifluoromethane sulfonate FT Raman spectroscopy Disorder-longitudinal acoustic mode Conformational disorder |
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