The kinetics of mutarotation in L-fucose as monitored by dielectric and infrared spectroscopy

Rok publikacji: 2014
Wydawca:  The Journal of Chemical Physics 2014, 140, 215101
Zobacz publikację
W. Kossack, W. K. Kipnusu, M. Dulski, K. Adrjanowicz, O. Madejczyk, E. Kaminska, E. U. Mapesa, M. Tress, K. Kaminski, F. Kremer
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.

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