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1 H, 13 C and 7 Li nuclear magnetic resonance study of the lithium chloride– N , N ‐dimethylacetamide system
Author(s) -
Germain J. Saint,
Vincendon M.
Publication year - 1983
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/omr.1270210607
Subject(s) - lithium chloride , dimethylacetamide , dissolution , chemistry , chloride , lithium (medication) , solvent , cellulose , inorganic chemistry , nuclear magnetic resonance spectroscopy , polymer , organic chemistry , medicine , endocrinology
The complex solvent obtained by dissolving 5‐10% of lithium chloride in N , N ‐dimethylacetamide (DMA) presents a good method for dissolving highly insoluble polymers, such as cellulose. 1 H, 13 C and 7 Li NMR spectroscopy have been used, together with viscosity and conductivity measurements, for the study of this complex solvent. The 1 H and 13 C chemical shift variations of DMA, on increasing the lithium chloride concentration, are found to be in opposite directions. The T 1 relaxation times show a large decrease in the mobility of DMA in the presence of lithium chloride. Methyl‐β‐ D ‐glucopyranoside has been used as a model for cellulose in order to investigate the mechanism of solution of this polymer. It was found that each hydroxy group of the solute interacts with one lithium chloride molecule in solution.