Study on temperature-dependent changes in hydrogen bonds in cellulose Ibeta by infrared spectroscopy with perturbation-correlation moving-window two-dimensional correlation spectroscopy.
Infrared (IR) spectra were measured for cellulose Ibeta prepared from the mantle of Halocynthia roretzi over a temperature range of 30-260 degrees C to explore the temperature-dependent changes in hydrogen bonds (H-bonds) in the crystal. Structural changes at the phase transition temperature of 220 degrees C are elucidated at the functional group level by perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy. The PCMW2D correlation spectra show that the intensities of bands arising from O3-H3...O5 and O2-H2...O6 intrachain H-bonds dramatically decrease at 220 degrees C, whereas the intensity changes of bands due to interchain H-bonds are not observed adequately. These results suggest that the phase transition is induced by the dissociation of the O3-H3...O5 and O2-H2...O6 intrachain H-bonds. However, the interchain H-bonds are not so much responsible for the transition directly.
Watanabe
Akihiko
A
Department of Chemistry and Research Center for Near Infrared Spectroscopy, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan.
Morita
Shigeaki
S
Ozaki
Yukihiro
Y
D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002482:Cellulose / Q000737:chemistry*; D006860:Hydrogen Bonding; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013696:Temperature
D002482:Cellulose