Watanabe Akihiko, Morita Shigeaki, Ozaki Yukihiro
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.
Biomacromolecules. 2006 Nov;7(11):3164-70. doi: 10.1021/bm0603591.
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.
测量了从柄海鞘外套膜制备的纤维素Iβ在30 - 260摄氏度温度范围内的红外（IR）光谱，以探究晶体中氢键（H键）随温度的变化。通过扰动相关移动窗口二维（PCMW2D）相关光谱在官能团水平上阐明了220摄氏度相变温度下的结构变化。PCMW2D相关光谱表明，由O3 - H3...O5和O2 - H2...O6链内H键产生的谱带强度在220摄氏度时急剧下降，而链间H键引起的谱带强度变化未得到充分观察。这些结果表明，相变是由O3 - H3...O5和O2 - H2...O6链内H键的解离引起的。然而，链间H键对相变的直接影响不大。
