scholarly journals Synthesis and investigation of physico-chemical properties of dicationic ionic liquids

2018 ◽  
Vol 5 (12) ◽  
pp. 181230 ◽  
Author(s):  
Yi-Xin Sun ◽  
Ying-Ying Wang ◽  
Bing-Bing Shen ◽  
Bi-Xian Zhang ◽  
Xiao-Mei Hu
Keyword(s):  
Ionic Liquids ◽  
Heterogeneous System ◽  
Room Temperature ◽  
Chemical Properties ◽  
Homogeneous System ◽  
The Other ◽  
Melting Points ◽  
Good Solubility ◽  
Physico Chemical ◽  
Dicationic Ionic Liquids

A series of dicationic ionic liquids (ILs) including [C 4 (MIM) 2 ][PF 6 ] 2 , [C 5 (MIM) 2 ][PF 6 ] 2 , [C 6 (MIM) 2 ][PF 6 ] 2 and [C 4 (PYR) 2 ][PF 6 ] 2 were synthesized. Their thermal stability and melting points were analysed. It was found that dicationic ILs presented important implications in the design of homogeneous and heterogeneous system with water. A homogeneous system of dicationic ILs with water could be formed at a relatively high temperature and then a heterogeneous system was formed when the solution was cooled to a low temperature. The ILs recovered by altering the temperature were obtained in high percentage yields of [C 4 (MIM) 2 ][PF 6 ] 2 (97.6%), [C 5 (MIM) 2 ][PF 6 ] 2 (97.3%), [C 6 (MIM) 2 ][PF 6 ] 2 (98.0%) and [C 4 (PYR) 2 ][PF 6 ] 2 (94.2%). On the other hand, [C 4 (MIM) 2 ][PF 6 ] 2 and [C 5 (MIM) 2 ][PF 6 ] 2 exhibited good solubility in acetonitrile and acetone. A homogeneous system could be achieved with imidazolium-based ILs with a relatively low amount of water and acetonitrile at room temperature. All of the properties of dicationic ILs have a strong correlation with the nature of dications, the linkage chain and the symmetry of dications. Dicationic ILs may provide a new opportunity for some specific applications in order to enable the effective separation and isolation of products.

15N NMR studies provide insights into physico-chemical properties of room-temperature ionic liquids

2021 ◽  
Author(s):  
Christoph Wiedemann ◽  
David Fushman ◽  
Frank Bordusa
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Chemical Properties ◽  
Room Temperature Ionic Liquids ◽  
15N Nmr ◽  
Nmr Studies ◽  
Physico Chemical ◽  
Alternative Solvents

Ionic liquids (ILs) have gained a lot of attention as alternative solvents in many fields of science in the last two decades. It is known that the type of anion...

Syntheses and Investigation of Properties of New Ionic Liquids Thiazolium Halogenide

2011 ◽  
Vol 332-334 ◽  
pp. 2036-2039 ◽  
Author(s):  
Qing Kai Wang ◽  
Hong Jun Zang ◽  
Fang Yang ◽  
Bo Wen Cheng ◽  
Yuan Lin Ren ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Room Temperature ◽  
High Conductivity ◽  
Room Temperature Ionic Liquids ◽  
Melting Points ◽  
Polar Solvents ◽  
Good Solubility

A series of novel thiazolium halogenide ionic liquids were synthesized by using 4-methylthiazole or 4-methyl-5-thiazoleethanol and halohydrocarbons as materials. The compounds were characterized and analyzed by elemental analysis, 1H NMR and DSC.The solubilities of the ionic liquids in organic dissolvents were observed, meanwhile the conductivities and melting points were measured. The results show that these ionic liquids have high conductivity in water and have good solubility in traditional polar solvents, such as H2O, ethanol and acetonitrile. And the thiazolium halogenide are room temperature ionic liquids, due to their low melting points.

Physico-chemical properties and nanoscale morphology in N-alkyl-N-methylmorpholinium dicyanamide room temperature ionic liquids

2013 ◽  
Vol 187 ◽  
pp. 252-259 ◽  
Author(s):  
Olga Russina ◽  
Ruggero Caminiti ◽  
Alessandro Triolo ◽  
Sunita Rajamani ◽  
Bernardo Melai ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Chemical Properties ◽  
Room Temperature Ionic Liquids ◽  
Physico Chemical ◽  
Nanoscale Morphology

Synthesis, Characterization and Applications of Dicationic Ionic Liquids in Organic Synthesis

2020 ◽  
Vol 17 (4) ◽  
pp. 450-464
Author(s):  
Mohammad Javaherian ◽  
Seyyed Jafar Saghanezhad
Keyword(s):  
Ionic Liquids ◽  
Organic Synthesis ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Dicationic Ionic Liquids ◽  
Physical And Chemical ◽  
Reaction Media ◽  
And Chemical Properties

Dicationic ionic liquids are an emerging group of Ionic Liquids (ILs) that are currently receiving much attention as green reaction media and catalysts. Because of a great number of possible combinations of cations and anions, the physical and chemical properties of dicationic ionic liquids are more tunable and broader than monocationic ILs. Therefore, their unique properties have made them the target of many applied and fundamental researches. Actually, dicationic ionic liquids are more effective and rather fascinating than traditional monocationic ILs. So, due to greater versatility and diversity, their applications in organic synthesis have been extensively grown. In this review, we have focused on the synthesis, characterization and applications of dicationic ionic liquids, especially, in organic synthesis.

scholarly journals Synthesis, antibiotic structure–activity relationships, and cellulose dissolution studies of new room-temperature ionic liquids derived from lignin

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Shihong Liu ◽  
Michael Gonzalez ◽  
Celine Kong ◽  
Scott Weir ◽  
Aaron M. Socha
Keyword(s):  
Antibacterial Activity ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Oxidation Products ◽  
Cellulose Dissolution ◽  
Melting Points ◽  
E Coli ◽  
Alkyl Chains ◽  
Renewable Feedstocks ◽  
Commodity Chemicals

Abstract Background Ionic liquids (ILs) are promising pretreatment solvents for lignocellulosic biomass, but are largely prepared from petroleum precursors. Benzaldehydes from depolymerized lignin, such as vanillin, syringaldehyde, and 4-methoxy benzaldehyde, represent renewable feedstocks for the synthesis of ionic liquids. We herein report syntheses of novel lignin-derived ionic liquids, with extended N-alkyl chains, and examine their melting points, cellulose dissolution capacities, and toxicity profiles against Daphnia magna and E. coli strain 1A1. The latter organism has been engineered to produce isoprenol, a drop-in biofuel and precursor for commodity chemicals. Results The new N,N-diethyl and N,N-dipropyl methyl benzylammonium ILs were liquids at room temperature, showing 75–100 °C decreased melting points as compared to their N,N,N-trimethyl benzylammonium analog. Extension of N-alkyl chains also increased antibacterial activity threefold, while ionic liquids prepared from vanillin showed 2- to 4-fold lower toxicity as compared to those prepared from syringaldehyde and 4-methoxybenzaldehyde. The trend of antibacterial activity for anions of lignin-derived ILs was found to be methanesulfonate < acetate < hydroxide. Microcrystalline cellulose dissolution, from 2 to 4 wt% after 20 min at 100 °C, was observed in all new ILs using light microscopy and IR spectroscopy. Conclusions Ionic liquids prepared from H-, S- and G-lignin oxidation products provided differential cytotoxic activity against E. coli and D. magna, suggesting these compounds could be tailored for application specificity within a biorefinery.

Cholinium-amino acid based ionic liquids: a new method of synthesis and physico-chemical characterization

2015 ◽  
Vol 17 (32) ◽  
pp. 20687-20698 ◽  
Author(s):  
Serena De Santis ◽  
Giancarlo Masci ◽  
Francesco Casciotta ◽  
Ruggero Caminiti ◽  
Eleonora Scarpellini ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Amino Acid ◽  
Room Temperature ◽  
Chemical Characterization ◽  
New Method ◽  
Room Temperature Ionic Liquids ◽  
Synthetic Method ◽  
Chemical Structures ◽  
Physico Chemical ◽  
Wide Range

Fourteen cholinium-amino acid based room temperature ionic liquids were prepared using a cleaner synthetic method. Chemicophysical properties were well correlated with the wide range of amino acid chemical structures.

Ionic Liquids in Analytical Chemistry: Applications and Recent Trends

2021 ◽  
Vol 17 ◽  
Author(s):  
Giuseppe Maria Merone ◽  
Angela Tartaglia ◽  
Enrica Rosato ◽  
Cristian D’Ovidio ◽  
Abuzar Kabir ◽  
...  
Keyword(s):  
Analytical Chemistry ◽  
Ionic Liquids ◽  
Stationary Phases ◽  
Extraction Procedure ◽  
Chemical Properties ◽  
Electrochemical Analysis ◽  
Physico Chemical ◽  
Recent Trends ◽  
Number Of Publications ◽  
Physical And Chemical

Background: Ionic liquids (ILs) are a unique class of compounds consisting exclusively of cations and anions that possess distinctive properties such as low volatility, high thermal stability, miscibility with water and organic solvents, electrolytic conductivity and non-flammability. Ionic liquids have been defined as "design solvents", because it is possible to modify their physical and chemical properties by appropriately choosing cations and anions, in order to meet the specific characteristics based on their potential application. Introduction: Due of their tunable nature and properties, ILs are considered as the perfect candidates for numerous applications in analytical chemistry including sample preparation, stationary phases in liquid or gas chromatography, additives in capillary electrophoresis, or in mass spectrometry for spectral and electrochemical analysis. In the last years, the number of publications regarding ILs has rapidly increased, highlighting the broad applications of these compounds in various fields of analytical chemistry. Results: This review first described the main physico-chemical characteristics of ionic liquids, and subsequently reported the various applications in different subdisciplines of analytical chemistry, including the extraction procedure and separation techniques. Furthermore, in each paragraph the most recent applications of ionic liquids in the food, environmental, biological, etc. fields have been described. Conclusion: Overall, the topic discussed highlights the key role of ionic liquids in analytical chemistry, giving hints for their future applications in chemistry but also in biology and medicine.

ChemInform Abstract: Physico-Chemical Properties of Task-Specific Ionic Liquids

ChemInform ◽  
2013 ◽  
Vol 44 (31) ◽  
pp. no-no
Author(s):  
Luis C. Branco ◽  
Goncalo V. S. M. Carrera ◽  
Joao Aires-de-Sousa ◽  
Ignacio Lopez Martin ◽  
Raquel Frade ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Chemical Properties ◽  
Physico Chemical

scholarly journals Studies on Cyanex-272 Complexes of Mg (II), Ca (II) and Fe (III)

1970 ◽  
Vol 42 (4) ◽  
pp. 475-482 ◽  
Author(s):  
M Badrul Islam ◽  
M Zahurul Haque ◽  
N Shamsul Islam
Keyword(s):  
Key Words ◽  
Magnetic Measurements ◽  
Phosphinic Acid ◽  
Chemical Properties ◽  
Decomposition Temperature ◽  
Complex Compounds ◽  
The Other ◽  
Spectral Studies ◽  
Cyanex 272 ◽  
Physico Chemical

Certain complex compounds were synthesized by the interaction of Mg(II), Ca(II) and Fe(III) halides with the solvent extracting reagent, Cyanex-272 i.e. bis (2,4,4- trimethylpentyl) phosphinic acid as ligand. All the prepared complexes have been characterized on the basis of their molar masses, conductivity, magnetic measurements and infrared and electronic spectral studies. The other physico-chemical properties e.g. colour, decomposition temperature have also been ascertained. Key words: Chanex-272 Bangladesh J. Sci. Ind. Res. 42(4), 475-482, 2007

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