Nanocage formation and structural anomalies in imidazolium ionic liquid glasses governed by alkyl chains of cations

Nanoscale ◽  
2020 ◽  
Vol 12 (38) ◽  
pp. 19982-19991 ◽  
Author(s):  
Olga D. Bakulina ◽  
Mikhail Yu. Ivanov ◽  
Sergey A. Prikhod'ko ◽  
Svetlana Pylaeva ◽  
Irina V. Zaytseva ◽  
...  

Alkyl chains of cations govern intriguing and prospective nanostructuring phenomena in glassy imidazolium-based ionic liquids.

MRS Advances ◽  
2019 ◽  
Vol 5 (27-28) ◽  
pp. 1449-1456
Author(s):  
James E. Knoop ◽  
Jeffrey R. Alston

ABSTRACTA perfluorinated ionic liquid, 1-(perfluorohexyl)-3-methylimidazolium iodide, was synthesized via microwave reaction and compared to a non-fluorinated analog. Typically, the synthesis of fluorinated ionic liquids involves long reaction times and multiple steps. We have demonstrated a shortened synthesis and a more straightforward procedure, by using a microwave reactor for the microwave-assisted synthesis of 1-(perfluorohexyl)-3-methylimidazolium iodide. The addition of fluorinated alkyl chains on imidazolium ionic liquid cations increases the molecular free volume of the ionic liquid which is beneficial for increasing CO2 physisorption. Computational and experimental data shows an increased CO2 solubility and capacity for fluorinated ionic liquids. The perfluoroalkyl functionalized ionic liquid is characterized using 1H and 19F NMR spectroscopy, FTIR spectroscopy, and DSC. By DSC, a crystallization onset is near -31 °C and while the onset of the melting point between -30 and -17 °C.


2012 ◽  
Vol 90 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Swapnil Sonar ◽  
Kenson Ambrose ◽  
Arthur D. Hendsbee ◽  
Jason D. Masuda ◽  
Robert D. Singer

Ionic ligands derived from a salen ligand containing two proximal 1,3-disubstituted imidazolium ionic liquid cores form cobalt(III) complexes capable of selectively oxidizing veratryl alcohol, a lignin model compound, to veratraldehyde using air as the source of oxygen. These complexes are easy to prepare, inexpensive, water stable, and soluble in ionic liquids, making them viable candidates for use as oxidation catalysts.


2014 ◽  
Vol 16 (39) ◽  
pp. 21340-21348 ◽  
Author(s):  
Catarina M. S. S. Neves ◽  
Kiki A. Kurnia ◽  
Karina Shimizu ◽  
Isabel M. Marrucho ◽  
Luís Paulo N. Rebelo ◽  
...  

The presence of fluorinated alkyl chains in ionic liquids is quite relevant regarding their thermophysical properties and aqueous phase behaviour.


2018 ◽  
Vol 20 (15) ◽  
pp. 9796-9805 ◽  
Author(s):  
Hailong Peng ◽  
Momoji Kubo ◽  
Hayato Shiba

The isotropic to mesophase transition upon the long-time annealing of a 1-dodecyl-3-methylimidazolium hexafluorophosphate ionic liquid at different temperatures is illustrated.


2010 ◽  
Vol 8 (2) ◽  
pp. 356-360 ◽  
Author(s):  
Nitin Mirgane ◽  
Sandip Kotwal ◽  
Anil Karnik

AbstractIonic liquids (IL) are gaining importance as green solvents. Imidazolium ionic liquid [bmim]+[Cl]−, an environmentally benign solvent, was found to promote the Diels-Alder reaction between anthrone and maleimides at room temperature with excellent yields. The ionic liquid played a dual role as solvent and catalyst.


2020 ◽  
Vol 13 (4) ◽  
pp. 413-419
Author(s):  
N. Santhi ◽  
K. Rajathi ◽  
S. Sridhar

Ionic liquids are exceptional chemical compounds that are used in many areas of modern science. Due to their highly adjustable nature and incomparable properties, ionic liquids have become key players in the areas of synthesis, catalysis, extraction, electrochemistry, analysis, biotechnology, etc. In addition to the physical and chemical properties of ionic liquids, their high biological activity has attracted considerable attention from biochemists, ecologists and medical professionals. Due to the properties mentioned above, an imidazolium ionic liquid solvent was used for the synthesis of nanostructure nanoparticles. In the present work, cubic form of pure Fe2O3, spherical nature of pure Ag (0) and hexagonal shaped hybrid Ag- Fe2O3 were successfully synthesized by a simple co-precipitation, reduction and co-precipitation processes. The synthesized nanoparticles were characterized in detail by spectral studies such as IR, XRD, SEM, EDX and TEM analysis. The size and shape of the particles were performed by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) techniques and Transmission Electron Microscope (TEM) techniques. Quality quantity and purity of the products was checked by Energy Dispersive X-Ray Analysis (EDX).


2015 ◽  
Vol 727-728 ◽  
pp. 34-37
Author(s):  
Li Ying Guo ◽  
Jun Shi ◽  
Jun Hai He ◽  
Ji Yue Huang ◽  
Peng Cheng Huang

Three kinds of functionalized imidazolium ionic liquid, 1-chloride (2-hydroxyethyl) -3-methyl imidazole ionic liquid [HeMIM]Cl, 1-bromide ethylamine-3-methyl imidazolium ionic liquid [AeMIM]Br and chlorinated 1-carboxyethyl-3-methyl imidazolium ionic liquid [CeMIM]Cl, were synthesized firstly. Subsequently, three kinds of supported silicon imidazolium ionic liquids were prepared from above ionic liquids with tetraethoxysilane by sol-gel method. The Chemical structure and crystal structure of the supported on silica based ionic liquids were analyzed by FTIR and XRD.


2006 ◽  
Vol 59 (7) ◽  
pp. 463 ◽  
Author(s):  
R. Kamakshi ◽  
Boreddy S. R. Reddy

2-Oxazolines have been synthesized using a solventless ionic liquid melt in good yields at ambient temperatures. The efficiency of various Lewis acid catalysts for the same reaction has been compared. The effectiveness of different alkyl chains in the ionic liquids for the synthesis of oxazolines has been studied and a butylmethylimidazolinium chloride/indium chloride melt has been found to be the best media for promoting the reaction.


RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 50938-50941 ◽  
Author(s):  
Marco Campetella ◽  
Serena De Santis ◽  
Ruggero Caminiti ◽  
Paolo Ballirano ◽  
Claudia Sadun ◽  
...  

The pre-peak in the X-ray scattering patterns of ionic liquids is not always due to alkyl chains. In choline–proline (a bio-compatible ionic liquid), it is due to second-shell cation–cation distances.


2005 ◽  
Vol 58 (3) ◽  
pp. 170 ◽  
Author(s):  
Piotr Stepnowski

The growing interest in the use of ionic liquids may soon result in their presence in the environment. In any evaluation of the environmental fate of these compounds, their sorption on soil is an essential parameter. This paper reports data on the sorption of ionic liquids on selected soils and marine sediments. Batch-equilibrium adsorption tests were conducted on a selection of imidazolium ionic liquid entities. All the compounds were strongly sorbed on all the soils under study. It seems that, regardless of the hydrophobic interaction with organic matter, non-hydrophobic interactions contribute to the sorption of these compounds to soils and sediments, which usually tends to occur with highly polar ionized groups such as quaternary moieties.


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