Fluorescence response of a dipolar organic solute in a dicationic ionic liquid (IL): is the behavior of dicationic IL different from that of usual monocationic IL?

2014 ◽  
Vol 16 (25) ◽  
pp. 12918-12928 ◽  
Author(s):  
Prabhat Kumar Sahu ◽  
Sudhir Kumar Das ◽  
Moloy Sarkar
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solvation Dynamics ◽  
Fluorescence Response ◽  
Coumarin 153 ◽  
Organic Solute ◽  
Dicationic Ionic Liquid ◽  
First Time

The solvation dynamics of coumarin 153 are compared in di and in mono-cationic-based ionic liquids for the first time.

Mapping the “Extra Solvent Power, ESP” of Ionic Liquids for Monomers, Polymers and Globular Nanoparticles

2017 ◽  
Author(s):  
Jose A. Pomposo
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Linear Polymers ◽  
Green Solvents ◽  
Ionic Polymers ◽  
First Time ◽  
Solvent Power

Understanding the miscibility behavior of ionic liquid (IL) / monomer, IL / polymer and IL / nanoparticle mixtures is critical for the use of ILs as green solvents in polymerization processes, and to rationalize recent observations concerning the superior solubility of some proteins in ILs when compared to standard solvents. In this work, the most relevant results obtained in terms of a three-component Flory-Huggins theory concerning the “Extra Solvent Power, ESP” of ILs when compared to traditional non-ionic solvents for monomeric solutes (case I), linear polymers (case II) and globular nanoparticles (case III) are presented. Moreover, useful ESP maps are drawn for the first time for IL mixtures corresponding to case I, II and III. Finally, a potential pathway to improve the miscibility of non-ionic polymers in ILs is also proposed.

scholarly journals Ion conformation and orientational order in a dicationic ionic liquid crystal studied by solid-state nuclear magnetic resonance spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Debashis Majhi ◽  
Sergey V. Dvinskikh
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystals ◽  
Bond Order ◽  
Van Der Waals ◽  
Orientational Order ◽  
Smectic Phase ◽  
Side Chains ◽  
Dicationic Ionic Liquid ◽  
Ionic Liquid Crystals

AbstractIonic liquids crystals belong to a special class of ionic liquids that exhibit thermotropic liquid-crystalline behavior. Recently, dicationic ionic liquid crystals have been reported with a cation containing two single-charged ions covalently linked by a spacer. In ionic liquid crystals, electrostatic and hydrogen bonding interactions in ionic sublayer and van der Waals interaction in hydrophobic domains are the main forces contributing to the mesophase stabilization and determining the molecular orientational order and conformation. How these properties in dicationic materials are compared to those in conventional monocationic analogs? We address this question using a combination of advanced NMR methods and DFT analysis. Dicationic salt 3,3′-(1,6-hexanediyl)bis(1-dodecylimidazolium)dibromide was studied. Local bond order parameters of flexible alkyl side chains, linker chain, and alignment of rigid polar groups were analyzed. The dynamic spacer effectively “decouples” the motion of two ionic moieties. Hence, local order and alignment in dicationic mesophase were similar to those in analogous single-chain monocationic salts. Bond order parameters in the side chains in the dicationic smectic phase were found consistently lower compared to double-chain monocationic analogs, suggesting decreasing contribution of van der Waals forces. Overall dication reorientation in the smectic phase was characterized by low values of orientational order parameter S. With increased interaction energy in the polar domain the layered structure is stabilized despite less ordered dications. The results emphasized the trends in the orientational order in ionic liquid crystals and contributed to a better understanding of interparticle interactions driving smectic assembly in this and analogous ionic mesogens.

Brønsted acidic ionic liquid-catalyzed dehydrative formation of isosorbide from sorbitol: introduction of a continuous process

2017 ◽  
Vol 7 (10) ◽  
pp. 2065-2073 ◽  
Author(s):  
Jie Deng ◽  
Bao-Hua Xu ◽  
Yao-Feng Wang ◽  
Xian-En Mo ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Continuous Process ◽  
Efficient Synthesis ◽  
Acidic Ionic Liquid ◽  
Highly Efficient ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
First Time

A highly efficient synthesis of isosorbide from sorbitol was developed using Brønsted acidic ionic liquids (BILs) as the catalyst for the first time.

scholarly journals Crystalline-like structures and multilayering in Langmuir films of ionic liquids at the air–water interface

2016 ◽  
Vol 52 (32) ◽  
pp. 5585-5588 ◽  
Author(s):  
Eduardo. J. M. Filipe ◽  
Pedro Morgado ◽  
Miguel Teixeira ◽  
Karina Shimizu ◽  
Nathalie Bonatout ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Langmuir Films ◽  
Water Interface ◽  
Air Water Interface ◽  
Reversible Formation ◽  
First Time

Langmuir films of [C18mim][NTf2] ionic liquid exhibited, for the first time, the reversible formation of crystalline-like structures at the surface of water, compatible with the formation of multilayers.

Mapping the “Extra Solvent Power, ESP” of Ionic Liquids for Monomers, Polymers and Globular Nanoparticles

2017 ◽  
Author(s):  
Jose A. Pomposo
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Linear Polymers ◽  
Green Solvents ◽  
Ionic Polymers ◽  
First Time ◽  
Solvent Power

Understanding the miscibility behavior of ionic liquid (IL) / monomer, IL / polymer and IL / nanoparticle mixtures is critical for the use of ILs as green solvents in polymerization processes, and to rationalize recent observations concerning the superior solubility of some proteins in ILs when compared to standard solvents. In this work, the most relevant results obtained in terms of a three-component Flory-Huggins theory concerning the “Extra Solvent Power, ESP” of ILs when compared to traditional non-ionic solvents for monomeric solutes (case I), linear polymers (case II) and globular nanoparticles (case III) are presented. Moreover, useful ESP maps are drawn for the first time for IL mixtures corresponding to case I, II and III. Finally, a potential pathway to improve the miscibility of non-ionic polymers in ILs is also proposed.

scholarly journals Efficient and Reusable Iron Catalyst to Convert CO2 into Valuable Cyclic Carbonates

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1089
Author(s):  
Ana P. C. Ribeiro ◽  
Peter Goodrich ◽  
Luísa M. D. R. S. Martins
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Catalytic Effect ◽  
Iron Catalyst ◽  
Cyclic Carbonate ◽  
Cyclic Carbonates ◽  
Mild Conditions ◽  
First Time

The production of cyclic carbonates from CO2 cycloaddition to epoxides, using the C-scorpionate iron(II) complex [FeCl2{κ3-HC(pz)3}] (pz = 1H-pyrazol-1-yl) as a catalyst, is achieved in excellent yields (up to 98%) in a tailor-made ionic liquid (IL) medium under mild conditions (80 °C; 1–8 bar). A favorable synergistic catalytic effect was found in the [FeCl2{κ3-HC(pz)3}]/IL system. Notably, in addition to exhibiting remarkable activity, the catalyst is stable during ten consecutive cycles, the first decrease (11%) on the cyclic carbonate yield being observed during the 11th cycle. The use of C-scorpionate complexes in ionic liquids to afford cyclic carbonates is presented herein for the first time.

Solvation dynamics and rotation of coumarin 153 in a new ionic liquid/molecular solvent mixture model: [BMIM][TFSI]/propylene carbonate

2017 ◽  
Vol 226 ◽  
pp. 48-55 ◽  
Author(s):  
Yevheniia Smortsova ◽  
François-Alexandre Miannay ◽  
Hanna Oher ◽  
Bogdan Marekha ◽  
Julien Dubois ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Mixture Model ◽  
Propylene Carbonate ◽  
Solvent Mixture ◽  
Solvation Dynamics ◽  
Coumarin 153

Pyridinium-clubbed dicationic ionic liquid electrolytes for efficient next-generation photo harvesting

2018 ◽  
Vol 42 (9) ◽  
pp. 6990-6996 ◽  
Author(s):  
Abhishek Dhar ◽  
Nadavala Siva Kumar ◽  
Mohammad Asif ◽  
Rohit L. Vekariya
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Next Generation ◽  
Photovoltaic Devices ◽  
Excellent Thermal Stability ◽  
Liquid Electrolytes ◽  
Dicationic Ionic Liquid ◽  
Dicationic Ionic Liquids

A new series of pyridinium based dicationic ionic liquids was designed and synthesized. The synthesized ionic liquids have excellent thermal stability and good ionic conductivity. They can be used as electrolytes in photovoltaic devices.

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