scholarly journals The physical significance of the Kamlet–Taft π* parameter of ionic liquids

2021 ◽  
Author(s):  
Nadine Weiß ◽  
Caroline H. Schmidt ◽  
Gabi Thielemann ◽  
Esther Heid ◽  
Christian Schröder ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physical Significance ◽  
Solvatochromic Probes

The Kamlet–Taft dipolarity/polarizability parameters π* for various ionic liquids were determined using 4-tert-butyl-2-((dicyanomethylene)-5-[4-N,N-diethylamino)-benzylidene]-Δ3-thiazoline and 5-(N,N-dimethylamino)-5′-nitro-2,2′-bithiophene as solvatochromic probes.

Understanding the efficiency of ionic liquids–DMSO as solvents for carbohydrates: use of solvatochromic- and related physicochemical properties

2020 ◽  
Vol 44 (35) ◽  
pp. 14906-14914 ◽  
Author(s):  
Thaís A. Bioni ◽  
Mayara L. de Oliveira ◽  
Marcella T. Dignani ◽  
Omar A. El Seoud
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Solvatochromic Probes

The quantification of interactions of solvatochromic probes with ionic liquids/DMSO serves as an expedient approach for predicting the solvent efficiency in dissolving carbohydrates

scholarly journals Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1917 ◽  
Author(s):  
Omar A. El Seoud ◽  
Marc Kostag ◽  
Kerstin Jedvert ◽  
Naved I. Malek
Keyword(s):  
Ionic Liquids ◽  
Theoretical Calculations ◽  
Chemical Properties ◽  
Lewis Acidity ◽  
Favorable Effect ◽  
Alkaline Solutions ◽  
Cellulose Solution ◽  
Cellulose Dissolution ◽  
Solvatochromic Probes ◽  
Cellulose Regeneration

This review is focused on assessment of solvents for cellulose dissolution and the mechanism of regeneration of the dissolved biopolymer. The solvents of interest are imidazole-based ionic liquids, quaternary ammonium electrolytes, salts of super-bases, and their binary mixtures with molecular solvents. We briefly discuss the mechanism of cellulose dissolution and address the strategies for assessing solvent efficiency, as inferred from its physico-chemical properties. In addition to the favorable effect of lower cellulose solution rheology, microscopic solvent/solution properties, including empirical polarity, Lewis acidity, Lewis basicity, and dipolarity/polarizability are determinants of cellulose dissolution. We discuss how these microscopic properties are calculated from the UV-Vis spectra of solvatochromic probes, and their use to explain the observed solvent efficiency order. We dwell briefly on use of other techniques, in particular NMR and theoretical calculations for the same purpose. Once dissolved, cellulose is either regenerated in different physical shapes, or derivatized under homogeneous conditions. We discuss the mechanism of, and the steps involved in cellulose regeneration, via formation of mini-sheets, association into “mini-crystals”, and convergence into larger crystalline and amorphous regions. We discuss the use of different techniques, including FTIR, X-ray diffraction, and theoretical calculations to probe the forces involved in cellulose regeneration.

Investigation of Various Ionic Liquids and Catalyst Materials for Lithium-Oxygen Batteries

2011 ◽  
pp. 110923034559006
Author(s):  
Arnd Garsuch ◽  
D. Michael Badine ◽  
Klaus Leitner ◽  
Luiz H. S. Gasparotto ◽  
Natalia Borisenko ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Lithium Oxygen Batteries
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