Cellulose

, Volume 20, Issue 1, pp 9–23

Quantum mechanical modeling of the structures, energetics and spectral properties of Iα and Iβ cellulose

  • James D. Kubicki
  • Mohamed Naseer-Ali Mohamed
  • Heath D. Watts
Original Paper

DOI: 10.1007/s10570-012-9838-6

Cite this article as:
Kubicki, J.D., Mohamed, M.NA. & Watts, H.D. Cellulose (2013) 20: 9. doi:10.1007/s10570-012-9838-6
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Abstract

Periodic planewave and molecular cluster density functional theory (DFT) calculations were performed on Iα and Iβ cellulose in four different conformations each. The results are consistent with the previous interpretation of experimental X-ray and neutron diffraction data that both Iα and Iβ cellulose are dominantly found in the tg conformation of the hydroxymethyl group with a H-bonding conformation termed “Network A”. Structural and energetic results of the periodic DFT calculations with dispersion corrections (DFT-D2) are consistent with observation suggesting that this methodology is accurate to within a few percent for modeling cellulose. The structural and energetic results were confirmed by comparison of calculated vibrational frequencies against observed infrared and Raman frequencies of Iα and Iβ cellulose. Structures extracted from the periodic DFT-D2 energy minimizations were used to calculate the 13C nuclear magnetic resonance chemical shifts (δ13C), and the tg/Network A conformations of both Iα and Iβ cellulose produced excellent correlations with observed δ13C values.

Keywords

Cellulose Infrared Raman NMR DFT 

Copyright information

© The Author(s) 2012

Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

Authors and Affiliations

  • James D. Kubicki
    • 1
  • Mohamed Naseer-Ali Mohamed
    • 2
  • Heath D. Watts
    • 1
  1. 1.Department of Geosciences and the Earth and Environmental Systems InstituteThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.School of Advanced SciencesVIT UniversityVelloreIndia

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