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Electron (charge) density studies of cellulose models

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Abstract

Introductory material first describes electron density approaches and demonstrates visualization of electron lone pairs and bonding as concentrations of electron density. Then it focuses on the application of Bader’s Quantum Theory of Atoms-in-Molecules (AIM) to cellulose models. The purpose of the work is to identify the various interactions that stabilize cellulose structure. AIM analysis aids study of non-covalent interactions, especially those for which geometric criteria are not well established. The models were in the form of pairs of cellotriose molecules, methylated at the O1 and O4 ends. Based on the unit cell of cellulose Iβ, there were corner–corner, and center–center pairs that correspond to (200) sheets, and corner–center pairings that corresponded to (1–10) and (110) stacks. AIM analysis (or charge-density topology analysis) was applied before and after minimization in vacuum and in continuum solvation. Besides the conventional O–H···O hydrogen bonds, all of which were known from geometric criteria, C–H···O hydrogen bonds (some previously reported), and some O···O and H···H interactions were found. Non-covalent bonds in the (200) sheets were maintained in all calculations with the exception of a weak, bifurcated O6–H···O2′′ bond that was not found in the corner–corner pair model and did not survive minimization. Nor did the O6···O4 interactions on the reducing ends of the triosides. Pairs of molecules along the (110) plane had an equal number (12) of non-covalent bonds compared to the pairs along the (1–10) plane, but the AIM parameters indicated the bonds between the pairs in the (110) plane were weaker. Intra-molecular O–H···O hydrogen bonds survived in these minimized pairs, but the relative chain alignments usually did not.

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Acknowledgments

The authors thank Drs. Frances Hill and Krystal Fontenot for critical comments on a preliminary version of the manuscript.

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Authors and Affiliations

  1. U.S. Department of Agriculture, Southern Regional Research Center, 1100 Robert E. Lee Blvd., New Orleans, LA, 70124, USA

    Alfred D. French, Monica Concha & Michael K. Dowd

  2. Department of Chemistry, University of New Orleans, New Orleans, LA, 70148, USA

    Alfred D. French & Edwin D. Stevens

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  1. Alfred D. French
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  2. Monica Concha
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  3. Michael K. Dowd
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  4. Edwin D. Stevens
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Correspondence to Alfred D. French.

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French, A.D., Concha, M., Dowd, M.K. et al. Electron (charge) density studies of cellulose models. Cellulose 21, 1051–1063 (2014). https://doi.org/10.1007/s10570-013-0042-0

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