التفاصيل البيبلوغرافية
| العنوان: |
The kinetics of mutarotation in L-fucose as monitored by dielectric and infrared spectroscopy. |
| المؤلفون: |
Kossack, Wilhelm, Kiprop Kipnusu, Wycliffe, Mateusz Dulski, Adrjanowicz, Karolina, Madejczyk, Olga, Kaminska, Ewa, Urandu Mapesa, Emmanuel, Tress, Martin, Kaminski, Kamil, Kremer, Friedrich |
| المصدر: |
Journal of Chemical Physics; 6/7/2014, Vol. 140 Issue 21, p215101-1-215101-6, 6p, 1 Diagram, 1 Chart, 6 Graphs |
| مصطلحات موضوعية: |
MUTAROTATION, FUCOSE, FOURIER transform infrared spectroscopy, BROADBAND dielectric spectroscopy, INTERMOLECULAR interactions |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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