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1D and 2D NMR Spectroscopy of Bonding Interactions within Stable and Phase-Separating Organic Electrolyte-Cellulose Solutions
File | Description | Size | Format | |
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accepted_article.pdf | Accepted version | 1.33 MB | Adobe PDF | View/Open |
Title: | 1D and 2D NMR Spectroscopy of Bonding Interactions within Stable and Phase-Separating Organic Electrolyte-Cellulose Solutions |
Authors: | Clough, MT Fares, C Rinaldi, R |
Item Type: | Journal Article |
Abstract: | Organic electrolyte solutions (i.e. mixtures containing an ionic liquid and a polar, molecular co-solvent) are highly versatile solvents for cellulose. However, the underlying solvent–solvent and solvent–solute interactions are not yet fully understood. Herein, mixtures of the ionic liquid 1-ethyl-3-methylimidazolium acetate, the co-solvent 1,3-dimethyl-2-imidazolidinone, and cellulose are investigated using 1D and 2D NMR spectroscopy. The use of a triply-13C-labelled ionic liquid enhances the signal-to-noise ratio for 13C NMR spectroscopy, enabling changes in bonding interactions to be accurately pinpointed. Current observations reveal an additional degree of complexity regarding the distinct roles of cation, anion, and co-solvent toward maintaining cellulose solubility and phase stability. Unexpectedly, the interactions between the dialkylimidazolium ring C2−H substituent and cellulose become more pronounced at high temperatures, counteracted by a net weakening of acetate–cellulose interactions. Moreover, for mixtures that exhibit critical solution behavior, phase separation is accompanied by the apparent recombination of cation–anion pairs. |
Issue Date: | 17-Aug-2017 |
Date of Acceptance: | 24-Jul-2017 |
URI: | http://hdl.handle.net/10044/1/57152 |
DOI: | https://dx.doi.org/10.1002/cssc.201701042 |
ISSN: | 0003-4592 |
Publisher: | Wiley-VCH Verlag |
Start Page: | 3452 |
End Page: | 3458 |
Journal / Book Title: | ChemSusChem |
Volume: | 10 |
Issue: | 17 |
Copyright Statement: | This is the peer reviewed version of the following article: M. T. Clough, C. Farès, R. Rinaldi, ChemSusChem 2017, 10, 3452., which has been published in final form at https://dx.doi.org/10.1002/cssc.201701042. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving. |
Keywords: | Science & Technology Physical Sciences Chemistry, Multidisciplinary GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Chemistry Science & Technology - Other Topics cellulose hydrogen bonding ionic liquids NMR organic electrolytes IONIC LIQUIDS I-BETA DISSOLUTION COSOLVENT SOLVENT SIMULATIONS TRANSITION MECHANISM ACETATE SYSTEMS Cellulose Electrolytes Imidazoles Ionic Liquids Magnetic Resonance Spectroscopy Solutions 0399 Other Chemical Sciences General Chemistry Organic Chemistry |
Publication Status: | Published |
Appears in Collections: | Chemical Engineering Faculty of Engineering |