Abstract
X-ray crystallographic and cross-polarization/magic angle spinning 13C nuclear magnetic resonance techniques have been used to study an ethylenediamine (EDA)-cellulose I complex, a transient structure in the cellulose I to cellulose IIII conversion. The crystal structure (space group P2 1 ; a = 4.546 Å, b = 11.330 Å, c = 10.368 Å and γ = 94.017°) corresponds to a one-chain unit cell with one glucosyl residue in the asymmetric unit, a gt conformation for the hydroxymethyl group, and one EDA molecule per glucosyl residue. Unusually, there are no O-H⋯O hydrogen bonds between the cellulose chains; the chains are arranged in hydrophobic stacks, stabilized by hydrogen bonds to the amine groups of bridging EDA molecules. This new structure is an example of a complex in which the cellulose chains are isolated from each other, and provides a number of insights into the structural pathway followed during the conversion of cellulose I to cellulose IIII through EDA treatment.
| Original language | English |
|---|---|
| Pages (from-to) | 943-957 |
| Number of pages | 15 |
| Journal | Cellulose |
| Volume | 16 |
| Issue number | 6 |
| DOIs | |
| State | Published - Dec 2009 |
| Externally published | Yes |
Funding
Biological and Environmental Research of the Department of Energy, a grant from the National Institute of Medical Sciences of the National Institutes of Health (1R01GM071939-01), and a Laboratory Directed Research and Development grant from Los Alamos National Laboratory (20080001DR). Acknowledgments We thank beam line BL38B1 at the SPring-8, Japan, for use of facilities. MW was supported by a Grant-in-Aid for Scientific Research (18780131). This study was partly funded by the French Agence Nationale de la Recherche. PL was supported in part by the Office of
Keywords
- Cellulose
- Ethylenediamine
- NMR
- X-ray crystallography