Lee, C. M., Kubicki, J. D., Fan, B., Zhong, L., Jarvis, M. C. and Kim, S. H. (2015) Hydrogen-bonding network and OH stretch vibration of cellulose: comparison of computational modeling with polarized IR and SFG spectra. Journal of Physical Chemistry B, 119(49), pp. 15138-15149. (doi: 10.1021/acs.jpcb.5b08015) (PMID:26615832)
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Abstract
Hydrogen bonds play critical roles in noncovalent directional interactions determining the crystal structure of cellulose. Although diffraction studies accurately determined the coordinates of carbon and oxygen atoms in crystalline cellulose, the structural information on hydrogen atoms involved in hydrogen-bonding is still elusive. This could be complemented by vibrational spectroscopy; but the assignment of the OH stretch peaks has been controversial. In this study, we performed calculations using density functional theory with dispersion corrections (DFT-D2) for the cellulose Iβ crystal lattices with the experimentally determined carbon and oxygen coordinates. DFT-D2 calculations revealed that the OH stretch vibrations of cellulose are highly coupled and delocalized through intra- and interchain hydrogen bonds involving all OH groups in the crystal. Additionally, molecular dynamics (MD) simulations of a single cellulose microfibril showed that the conformations of OH groups exposed at the microfibril surface are not well-defined. Comparison of the computation results with the experimentally determined IR dichroism of uniaxially aligned cellulose microfibrils and the peak positions of various cellulose crystals allowed unambiguous identification of OH stretch modes observed in the vibrational spectra of cellulose.
| Item Type: | Articles |
|---|---|
| Additional Information: | The SFG, DFT, and MD studies were supported by The Center for Lignocellulose Structure and Formation, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Basic Energy Sciences, under Award Number DE-SC0001090; and the IR study was supported the UK BBSRC under Award Number 17/ D13342. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Jarvis, Dr Michael |
| Authors: | Lee, C. M., Kubicki, J. D., Fan, B., Zhong, L., Jarvis, M. C., and Kim, S. H. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Journal of Physical Chemistry B |
| Publisher: | American Chemical Society |
| ISSN: | 1520-6106 |
| ISSN (Online): | 1520-5207 |
| Published Online: | 30 November 2015 |
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