Fourier Transform Infrared Spectroscopy and Broadband Dielectric Spectroscopy are combined to trace kinetics of mutarotation in L-fucose. After quenching molten samples down to temperatures between T=313 K and 328 K, the concentrations of two anomeric species change according to a simple exponential time dependence, as seen by an increase in absorbance of specific IR-vibrations. In contrast, the dielectric spectra reveal a slowing down of the structural (α-) relaxation process according to a stretched exponential time dependence (stretching exponent of 1.5 ± 0.2). The rates of change in the IR absorption for α- and β-fucopyranose are (at T = 313 K) nearly one decade faster than that of the intermolecular interactions as measured by the shift of the α-relaxation. This reflects the fact that the α-relaxation monitors the equilibration at a mesoscopic length scale, resulting from fluctuations in the anomeric composition.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:21259 |
| Date | 22 May 2018 |
| Creators | Kossack, Wilhelm, Kipnusu, Wycliffe Kiprop, Dulski, Mateusz, Adrjanowicz, Karolina, Madejczyk, Olga, Kaminska, Ewa, Mapesa, Emmanuel Urandu, Tress, Martin, Kaminski, Kamil, Kremer, Friedrich |
| Publisher | AIP Publishing |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 215101 |
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