A fresh perspective on dissociation mechanism of cellulose in DMAc/LiCl system based on Li bond theory.
Int J Biol Macromol
; 268(Pt 1): 131729, 2024 May.
Article
em En
| MEDLINE
| ID: mdl-38653429
ABSTRACT
In this case, various characterization technologies have been employed to probe dissociation mechanism of cellulose in N,N-dimethylacetamide/lithium chloride (DMAc/LiCl) system. These results indicate that coordination of DMAc ligands to the Li+-Cl- ion pair results in the formation of a series of Lix(DMAc)yClz (x = 1, 2; y = 1, 2, 3, 4; z = 1, 2) complexes. Analysis of interaction between DMAc ligand and Li center indicate that Li bond plays a major role for the formation of these Lix(DMAc)yClz complexes. And the saturation and directionality of Li bond in these Lix(DMAc)yClz complexes are found to be a tetrahedral structure. The hydrogen bonds between two cellulose chains could be broken at the nonreduced end of cellulose molecule via combined effects of basicity of Cl- ion and steric hindrance of [Li (DMAc)4]+ unit. The unique feature of Li bond in Lix(DMAc)yClz complexes is a key factor in determination of the dissociation mechanism.
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Base de dados:
MEDLINE
Assunto principal:
Celulose
/
Cloreto de Lítio
/
Acetamidas
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article