Structural features of ionic liquids: consequences for material preparation and organic reactivity

2013 ◽  
Vol 15 (10) ◽  
pp. 2655 ◽  
Author(s):  
Cameron C. Weber ◽  
Anthony F. Masters ◽  
Thomas Maschmeyer
Keyword(s):  
Ionic Liquids ◽  
Structural Features ◽  
Material Preparation ◽  
Organic Reactivity

Organic Reactivity in Ionic Liquids: Some Mechanistic Insights into Nucleophilic Substitution Reactions

2005 ◽  
Vol 2005 (7) ◽  
pp. 413-417 ◽  
Author(s):  
N. Llewellyn Lancaster
Keyword(s):  
Ionic Liquids ◽  
Nucleophilic Substitution ◽  
Organic Reactions ◽  
Substitution Reactions ◽  
Nucleophilic Substitutions ◽  
Nucleophilic Substitution Reactions ◽  
Quantitative Studies ◽  
Alternative Solvents ◽  
Molecular Solvents ◽  
Organic Reactivity

Ionic liquids have been advanced as alternative solvents for organic reactions. In this paper, the principal findings of studies on nucleophilic substitutions in ionic liquids are reviewed. Thus our examination of halides (Cl-, Br- and I) in a range of ionic liquids is combined with our study of amine nucleophilicity into a single narrative. There have been a few other quantitative studies of nucleophilic substitutions in ionic liquids, and the results of these studies are also summarised in this work. These data are compared to related reactions in molecular solvents, and used to show where ionic liquids do (and do not) offer advantages over molecular solvents for nucleophilic substitutions.

scholarly journals Characterization of Ionic Liquid Lignins Isolated from Spruce Wood with 1-Butyl-3-methylimidazolium Acetate and Methyl Sulfate and Their Binary Mixtures with DMSO

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2479 ◽  
Author(s):  
Artyom V. Belesov ◽  
Anton V. Ladesov ◽  
Ilya I. Pikovskoi ◽  
Anna V. Faleva ◽  
Dmitry S. Kosyakov
Keyword(s):  
Ionic Liquids ◽  
Binary Mixtures ◽  
Plant Biomass ◽  
High Resolution Mass Spectrometry ◽  
Covalent Binding ◽  
Structural Features ◽  
Size Exclusion ◽  
Hydroxyl Groups ◽  
Spruce Wood

Ionic liquids (ILs) based on 1-butyl-3-methylimidazolium (bmim) cation have proved to be promising solvents for the fractionation of plant biomass with the production of cellulose and lignin. This study deals with the characterization of lignins isolated from coniferous (spruce) wood using [bmim]OAc and [bmim]MeSO4 ionic liquids and their binary mixtures with DMSO (80:20). Molecular weight distributions, functional composition, and structural features of IL lignins were studied by size-exclusion chromatography, NMR spectroscopy (1D and 2D) and atmospheric pressure photoionization high-resolution mass spectrometry. It was shown that the interaction of ILs with lignin leads to significant chemical changes in the biopolymer; a decrease in the degree of polymerization and in the content of free phenolic hydroxyl groups due to alkylation, the disappearance (in the case of [bmim]OAc) of carbonyl groups and a significant destruction of β-O-4 bonds. The chemical reactions between lignin and 1-butyl-3-methylidazolium cation with covalent binding of ionic liquids or products of their decomposition is evidenced by the presence of a large number of nitrogen-containing oligomers in IL lignins.

scholarly journals Fluorescence and Molecular Simulation Studies on the Interaction between Imidazolium-Based Ionic Liquids and Calf Thymus DNA

Processes ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 13
Author(s):  
Khairulazhar Jumbri ◽  
Mohd Azlan Kassim ◽  
Normawati M. Yunus ◽  
Mohd Basyaruddin Abdul Rahman ◽  
Haslina Ahmad ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Double Helix ◽  
Structural Features ◽  
Docking Studies ◽  
Calf Thymus Dna ◽  
Valuable Insight ◽  
Screening Model ◽  
Calf Thymus ◽  
A Minor ◽  
Insight Into

This work presents a molecular level investigation on the nature and mode of binding between imidazolium-based ionic liquids (ILs) ([Cnbim]Br where n = 2, 4, 6) with calf thymus DNA. This investigation offers valuable insight into the mechanisms of interactions that can affect the structural features of DNA and possibly cause the alteration or inhibition of DNA function. To expedite analysis, the study resorted to using molecular docking and COnductor like Screening MOdel for Real Solvents (COSMO-RS) in conjunction with fluorescence spectroscopic data for confirmation and validation of computational results. Both the fluorescence and docking studies consistently revealed a weak interaction between the two molecules, which corresponded to the binding energy of a stable docking conformation in the range of −5.19 to −7.75 kcal mol−1. As predicted, the rod-like structure of imidazolium-based ILs prefers to bind to the double-helix DNA through a minor groove. Interestingly, the occurrence of T-shape π-π stacking was observed between the amine group in adenine that faces the aromatic ring of imidazole. In addition, data of COSMO-RS for the interaction of individual nucleic acid bases to imidazolium-based ILs affirmed that ILs showed a propensity to bind to different bases, the highest being guanine followed by cytosine, thymine, uracil, and adenine.

Influence of chain length in protic ionic liquids on physicochemical and structural features of lignins from sugarcane bagasse

2021 ◽  
Vol 159 ◽  
pp. 113080
Author(s):  
Thaynara C. Pin ◽  
Lívia B. Brenelli ◽  
Viviane M. Nascimento ◽  
Aline C. Costa ◽  
Yunqiao Pu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Chain Length ◽  
Sugarcane Bagasse ◽  
Structural Features ◽  
Protic Ionic Liquids

Ionic liquids: solvent properties and organic reactivity

2005 ◽  
Vol 18 (4) ◽  
pp. 275-297 ◽  
Author(s):  
Cinzia Chiappe ◽  
Daniela Pieraccini
Keyword(s):  
Ionic Liquids ◽  
Solvent Properties ◽  
Organic Reactivity

Ionic Liquids: Solvent Properties and Organic Reactivity

ChemInform ◽  
2005 ◽  
Vol 36 (33) ◽  
Author(s):  
Cinzia Chiappe ◽  
Daniela Pieraccini
Keyword(s):  
Ionic Liquids ◽  
Solvent Properties ◽  
Organic Reactivity
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