Physicochemical properties determined by ΔpKa for protic ionic liquids based on an organic super-strong base with various Brønsted acids

2012 ◽  
Vol 14 (15) ◽  
pp. 5178 ◽  
Author(s):  
Muhammed Shah Miran ◽  
Hiroshi Kinoshita ◽  
Tomohiro Yasuda ◽  
Md. Abu Bin Hasan Susan ◽  
Masayoshi Watanabe
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Bronsted Acids ◽  
Protic Ionic Liquids ◽  
Strong Base

Protic Ionic Liquids Based on a Super-Strong Base: Correlation between Physicochemical Properties and ΔpKa

2012 ◽  
Vol 1473 ◽  
Author(s):  
Muhammed Shah Miran ◽  
Hiroshi Kinoshita ◽  
Tomohiro Yasuda ◽  
Md. Abu Bin Hasan Susan ◽  
Kaoru Dokko ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Thermal Analyses ◽  
High Thermal Stability ◽  
Viscosity Data ◽  
Protic Ionic Liquids ◽  
Neutral Species ◽  
Strong Base ◽  
Coulombic Interactions ◽  
Weight Loss Process

ABSTRACT1,8-Diazabicyclo[5,4,0]undec-7-ene (DBU) was neutralized by a range of Brønsted acids with a wide variation in the ΔpKa values of their constituent acids and base. The salts exhibited properties characteristic of an ionic liquid, such as high thermal stability and liquidity near ambient temperature. Analyses of thermal behaviors and temperature dependencies of density, viscosity (η), and ionic conductivity were made to correlate the physicochemical properties with the ΔpKa value of the obtained protic ionic liquids (PILs). Differential thermal analyses (DTA) revealed that PILs with high ΔpKa values underwent thermal decomposition resembling their aprotic counterparts; however, PILs with a low ΔpKa exhibited the evaporation of neutral species progressively generated from the shifting of the equilibrium toward neutral components during the weight loss process. The ionicity of the PILs, determined from Walden plots utilizing density, conductivity, and viscosity data, was found to decrease as temperature increased, and this effect was more pronounced for low ΔpKa values, possibly because of the shifting of the equilibrium and the imbalance between strong hydrogen bonds and Coulombic interactions. Fragility, estimated from plots of log(η) versus the scaled temperature Tg/T was found to be lower for PILs than for DBU owing to neutralization. [DBU]-based PILs exhibit intermediate fragility in nature, but this fragility becomes more prominent for PILs with low ΔpKa values

Effect of anion chain length on physicochemical properties of N,N-dimethylethanolammonium based protic ionic liquids

2016 ◽  
Vol 415 ◽  
pp. 1-7 ◽  
Author(s):  
Gyanendra Sharma ◽  
Ramesh L. Gardas ◽  
Alberto Coronas ◽  
G. Venkatarathnam
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Chain Length ◽  
Protic Ionic Liquids

Hydrogen bonds in protic ionic liquids and their correlation with physicochemical properties

2011 ◽  
Vol 47 (47) ◽  
pp. 12676 ◽  
Author(s):  
Muhammed Shah Miran ◽  
Hiroshi Kinoshita ◽  
Tomohiro Yasuda ◽  
Md. Abu Bin Hasan Susan ◽  
Masayoshi Watanabe
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Physicochemical Properties ◽  
Protic Ionic Liquids

Key factor governing the physicochemical properties and extent of proton transfer in protic ionic liquids: ΔpKa or chemical structure?

2019 ◽  
Vol 21 (1) ◽  
pp. 418-426 ◽  
Author(s):  
Muhammed Shah Miran ◽  
Mahfuzul Hoque ◽  
Tomohiro Yasuda ◽  
Seiji Tsuzuki ◽  
Kazuhide Ueno ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Proton Transfer ◽  
Physicochemical Properties ◽  
Chemical Structure ◽  
Protic Ionic Liquids ◽  
Key Factor ◽  
Factor Governing

A series of protic ionic liquids (PILs) are prepared by neutralisation of bis(trifluoromethanesulfonyl)amide acid (H[NTf2]) with various amines, and the properties (especially thermal stability and ionicity) are compared with those of PILs from 1,8-diazabicyclo[5.4.0]-7-undecene (DBU) and various acids.

Physicochemical properties of imidazo-pyridine protic ionic liquids

2013 ◽  
Vol 1 (38) ◽  
pp. 11570 ◽  
Author(s):  
Shidokht Nazari ◽  
Stanley Cameron ◽  
Michel B. Johnson ◽  
Khashayar Ghandi
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Protic Ionic Liquids

Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes

2018 ◽  
Vol 206 ◽  
pp. 353-364 ◽  
Author(s):  
Muhammed Shah Miran ◽  
Tomohiro Yasuda ◽  
Ryoichi Tatara ◽  
Md. Abu Bin Hasan Susan ◽  
Masayoshi Watanabe
Keyword(s):  
Ionic Liquids ◽  
Fuel Cell ◽  
Strong Acid ◽  
Trifluoromethanesulfonic Acid ◽  
Electrochemical Activity ◽  
Protic Ionic Liquids ◽  
Strong Base ◽  
Acid And Base ◽  
Cell Electrolytes ◽  
Fuel Cell Electrolytes

Amphoteric water was mixed with equimolar amounts of a super-strong acid, trifluoromethanesulfonic acid (TfOH), and a super-strong base, 1,8-diazabicyclo-[5.4.0]-7-undecene (DBU) to explore the properties as fuel cell electrolytes.

scholarly journals Ionic Liquids as High-Performance Lubricants and Lubricant Additives

2021 ◽  
Author(s):  
Hong Guo ◽  
Patricia Iglesias Victoria
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
High Performance ◽  
Negative Impact ◽  
Molecular Structures ◽  
Lubricant Additives ◽  
Friction Reduction ◽  
Protic Ionic Liquids ◽  
Protection Mechanisms ◽  
Low Toxicity

Taking into account the environmental awareness and ever-growing restrictive regulations over contamination, the study of new lubricants or lubricant additives with high performance and low toxicity over the traditional lubes to reduce the negative impact on the environment is needed. In this chapter, the current literature on the use of ionic liquids, particularly protic ionic liquids, as high-performance lubricants and lubricant additives to different types of base lubricants are reviewed and described. The relation between ionic liquids structures and their physicochemical properties, such as viscosity, thermal stability, corrosion behavior, biodegradability, and toxicity, is elaborated. Friction reduction and wear protection mechanisms of the ionic liquids are discussed with relation to their molecular structures and physicochemical properties.

Alkylimidazolium Protic Ionic Liquids: Structural Features and Physicochemical Properties

ChemPhysChem ◽  
2021 ◽  
Author(s):  
Liudmila E. Shmukler ◽  
Irina V. Fedorova ◽  
Yuliya Fadeeva ◽  
Matvey S. Gruzdev ◽  
Liubov P. Safonova
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Structural Features ◽  
Protic Ionic Liquids
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