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Étude, par spectroscopie de vibration, de deux solvants de la cellulose: La <i>N</i>-méthyl morpholine <i>N</i>-oxyde et son monohydrate
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1982
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Dipole–dipole InteractionEngineeringBiochemistryPhysicochemical AnalysisNatural SciencesHemicelluloseOrganic ChemistryBiopolymersPhysical ChemistryPolysaccharideChemistryWater MoleculesCellulose DissolutionSon MonohydratePar SpectroscopieNanocelluloseBiophysics
The ir and Raman spectra of N-methyl morpholine N-oxide and its monohydrate have been investigated in the frequency range 4000–50 cm −1 . For these two compounds, classified among the best cellulose solvents, there exists only the conformer where NO and CH 3 groups are respectively in axial and equatorial positions. For anhydrous N-methyl morpholine N-oxide, the dipole–dipole interaction is characterized by a strong line at 75 cm −1 in the Raman spectra.The molecules can be divided into two parts: a hydrophobic part (O(CH 2 ) 2 ) not active in the cellulose dissolution, and a hydrophilic part, which is able to stabilize a chain of water molecules and reveals the importance of the pyramidal environment of water molecules in the monohydrate.