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- Title
The structure of the complex of cellulose I with ethylenediamine by X-ray crystallography and cross-polarization/magic angle spinning <sup>13</sup>C nuclear magnetic resonance.
- Authors
Wada, Masahisa; Heux, Laurent; Nishiyama, Yoshiharu; Langan, Paul
- 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.
- Subjects
X-ray crystallography; NUCLEAR magnetic resonance; CELLULOSE; HYDROGEN bonding; AMINES
- Publication
Cellulose, 2009, Vol 16, Issue 6, p943
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-009-9338-5