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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Supramolecular interactions between functional saccharide-based ionic liquids and cellulose macromolecules.

Sibo Qiao1, Lulu Dong1, Yifan Jia1

  • 1School of Chemical Science and Technology, National Demonstration Center for Experimental Chemistry and Chemical Engineering Education, Yunnan University, Kunming 650091, China.

International Journal of Biological Macromolecules
|January 31, 2024
PubMed
Summary

Saccharide-based ionic liquids (SILs) effectively reduce hydrogen bonds in cellulose, with glucose-SILs showing the strongest interactions. This research offers new insights into polysaccharide-IL interactions for material applications.

Keywords:
2D-correlation FTIRSaccharide-based ionic liquidSupramolecular interaction

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Understanding molecular interactions between polysaccharides and ionic liquids (ILs) is crucial for their dissolution and plasticization.
  • Polysaccharides like cellulose have complex structures dominated by intra- and inter-molecular hydrogen bonds.

Purpose of the Study:

  • To synthesize saccharide-based ionic liquids (SILs) and investigate their interactions with cellulose macromolecules.
  • To elucidate the mechanism of SILs in reducing hydrogen bonding within polysaccharides.
  • To explore the dynamic variations in supramolecular interactions using advanced spectroscopic techniques.

Main Methods:

  • Synthesis of various SILs (glucose-, sucrose-, and raffinose-based).
  • Soaking cellulose membranes in different SILs to evaluate interactions.
  • Utilizing 2D correlation and perturbation-correlation moving window Fourier transform infrared (FTIR) spectroscopy to analyze dynamic variations in supramolecular interactions.

Main Results:

  • SILs effectively reduce intra- and/or inter-molecular hydrogen bonds in cellulose.
  • Glucose-based IL exhibited the strongest supramolecular interactions with cellulose compared to other SILs.
  • New -Cl⋯HO hydrogen bonding interactions were identified in SILs-modified cellulose membranes.
  • Specific supramolecular interactions (-Cl⋯H, HO⋯H, C-Cl⋯H, -C=O⋯H) showed sequential responses to temperature stimuli.

Conclusions:

  • This study provides novel insights into the molecular-level interactions between SILs and polysaccharides.
  • The findings pave the way for developing advanced ILs for efficient polysaccharide dissolution and thermoplasticization.
  • The use of advanced FTIR techniques offers a new perspective for studying dynamic supramolecular interactions.