NMR spectroscopic studies of cellobiose solvation in EmimAc aimed to understand the dissolution mechanism of cellulose in ionic liquids

2010 ◽  
Vol 12 (8) ◽  
pp. 1941 ◽  
Author(s):  
Jinming Zhang ◽  
Hao Zhang ◽  
Jin Wu ◽  
Jun Zhang ◽  
Jiasong He ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Spectroscopic Studies ◽  
Dissolution Mechanism

scholarly journals Towards understanding of delignification of grassy and woody biomass in cholinium-based ionic liquids

2021 ◽  
Author(s):  
Mood Mohan ◽  
Hemant Choudhary ◽  
Anthe George ◽  
Blake A. Simmons ◽  
Kenneth Sale ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Molecular Dynamics Simulations ◽  
Woody Biomass ◽  
Dissolution Mechanism ◽  
Dynamics Simulations ◽  
Multiple Hydrogen Bonds

Herein we report the dissolution mechanism of lignin in cholinium-based ionic liquids by molecular dynamics simulations. Multiple hydrogen bonds, longer HB lifetimes, and higher pKa of [Ch][Lys] makes it a better solvent for lignin than acidic ILs.

scholarly journals A NEW CLASS OF IONIC SOLVENTS, ELECTROLYTES AND ENGINEERING FLUIDS BASED ON 1,3-ALKYLMETHYL-1,2,3-BENZOTRIAZOLIUM SALTS

2010 ◽  
Vol 6 (2) ◽  
pp. 111-116 ◽  
Author(s):  
Ahmad Mudzakir
Keyword(s):  
Ionic Liquids ◽  
Single Crystal ◽  
Thermal Analyses ◽  
Spectroscopic Studies ◽  
Electrochemical Analysis ◽  
Electrochemical Characteristics ◽  
Melting Points ◽  
X Ray ◽  
Good Thermal Stability ◽  
New Class

A new series of ionic liquids based on 1,3-alkylmethyl-1,2,3-benzotriazolium cation has been prepared. The spectroscopic, physical and electrochemical characteristics of this family of salts have been investigated with respect to potential usage as ionic solvents, electrolytes and engineering fluids. Incorporation of diverse anions including weak coordinating anion and pseudohalide with this benzotriazolium cation produces ionic liquids with advantageously low melting points and good thermal stability. Thermal analyses of these very stable salts included the determination of melting points (-65 to 164 oC) and decomposition temperatures (up to 291 oC). The electrochemical windows of representative benzotriazolium species has been investigated by cyclic voltammetry and determined to be ~ 3 V. The X-ray single crystal and spectroscopic studies revealed that weak hydrogen-bonding interactions between the benzotriazolium ring protons and the anions are present both in the solid state as well as in solution.   Keywords: ionic liquids, X-ray single crystal, thermal analysis, electrochemical analysis, benzotriazolium salt

Spectroscopic studies of the aggregation of imidazolium-based ionic liquids

2008 ◽  
Vol 329 (1-2) ◽  
pp. 75-81 ◽  
Author(s):  
Hucheng Zhang ◽  
Kun Li ◽  
Huijun Liang ◽  
Jianji Wang
Keyword(s):  
Ionic Liquids ◽  
Spectroscopic Studies

Experimental Research on the Solubility of Cellulose in Different Ionic Liquids

2013 ◽  
Vol 690-693 ◽  
pp. 1568-1571 ◽  
Author(s):  
Xiao Jun Li ◽  
Yu Shan Sun ◽  
Qiang Zhao
Keyword(s):  
Ionic Liquids ◽  
Dimethyl Sulfoxide ◽  
Experimental Research ◽  
Dissolution Process ◽  
Dissolution Mechanism ◽  
Melting Points ◽  
Mechanical Stirring ◽  
Polarizing Microscope

Solubilities of cellulose in several ionic liquids were investigated by using Thermal Platform Polarizing Microscope (TPPM) and mechanical stirring. The results showed that all the ionic liquids used could dissolve cellulose except 1-ethyl-3-methylimidazolium bromide ([EMIM]Br). The dissolution process of cellulose experienced five steps including infiltration, limited swelled, partially dissolved, dissociation and completely dissolved. Ionic liquids with the cellulose-dissolving temperatures from low to high in sequence was 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) < 1-butyl-3-methylimidazolium acetate ([BMIM]Ac) < 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) < 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl) < 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) < 1-benzyl-3-methylimidazolium chloride ([BZMIM]Cl), while the solubility reduced in turn and the melting points or viscosities of the ionic liquids increased in the same order. Addition of some N,N-dimethyl sulfoxide to the solvents promoted ionic liquids to dissolve cellulose quickly. When dissolution process was applied by mechanical stirring, cellulose partially swelled and looked like "Lamb skewers" before dissolved. The dissolution mechanism was discussed.

Layered Structure of Room-Temperature Ionic Liquids in Microemulsions by Multinuclear NMR Spectroscopic Studies

2011 ◽  
Vol 17 (24) ◽  
pp. 6837-6846 ◽  
Author(s):  
R. Dario Falcone ◽  
Bharat Baruah ◽  
Ernestas Gaidamauskas ◽  
Christopher D. Rithner ◽  
N. Mariano Correa ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Layered Structure ◽  
Room Temperature ◽  
Spectroscopic Studies ◽  
Room Temperature Ionic Liquids ◽  
Multinuclear Nmr

scholarly journals Basicity Characterization of Imidazolyl Ionic Liquids and Their Application for Biomass Dissolution

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Chao Liu ◽  
Youming Li ◽  
Yi Hou
Keyword(s):  
Ionic Liquids ◽  
Ionization Constant ◽  
Dissolution Mechanism ◽  
Uv Spectrum ◽  
Different Temperatures ◽  
Biomass Dissolution ◽  
Dissolution Ratio ◽  
The Relationship ◽  
Acid Function

Alkalinity determination is of crucial significance for the applications of basic ionic liquids with imidazolyl. In this work, the ionization constant pKb value and acid function H- values of ionic liquids synthesized were calculated by pH method and UV spectrum-Hammett method. The dissolution ratio of biomass in these ionic liquids was measured at different temperatures. Finally, the relationship between the alkalinity and structure of these ionic liquids was discussed, and the relationship between the alkalinity of ionic liquid and the dissolution mechanism biomass was also discussed. The results show that the basicity of carboxylate ionic liquids is determined mainly by their anions, whereas cations take some finely tuned roles. Furthermore, cations and anions are equally important and are involved in dissolution mechanisms.

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