Solute–solvent hydrogen-bonding in room temperature ionic liquids studied by Raman spectroscopy

2012 ◽  
Vol 14 (39) ◽  
pp. 13676 ◽  
Author(s):  
Akira Kobayashi ◽  
Koji Osawa ◽  
Masahide Terazima ◽  
Yoshifumi Kimura
Keyword(s):  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids

Lithium Ion Solvation in Room-Temperature Ionic Liquids Involving Bis(trifluoromethanesulfonyl) Imide Anion Studied by Raman Spectroscopy and DFT Calculations

2007 ◽  
Vol 111 (45) ◽  
pp. 13028-13032 ◽  
Author(s):  
Yasuhiro Umebayashi ◽  
Takushi Mitsugi ◽  
Shuhei Fukuda ◽  
Takao Fujimori ◽  
Kenta Fujii ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquids ◽  
Dft Calculations ◽  
Room Temperature ◽  
Lithium Ion ◽  
Ion Solvation ◽  
Room Temperature Ionic Liquids

Hydrogen-Bonding Interactions and Protic Equilibria in Room-Temperature Ionic Liquids Containing Crown Ethers

2011 ◽  
Vol 115 (14) ◽  
pp. 3912-3918 ◽  
Author(s):  
Timothy W. Marin ◽  
Ilya A. Shkrob ◽  
Mark L. Dietz
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Crown Ethers ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Hydrogen Bonding Interactions

scholarly journals The role of hydrogen bonding in controlling the selectivity of Diels–Alder reactions in room-temperature ionic liquids

2002 ◽  
Vol 4 (5) ◽  
pp. 517-520 ◽  
Author(s):  
Ajay Aggarwal ◽  
N. Llewellyn Lancaster ◽  
Alick R. Sethi ◽  
Tom Welton
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Diels Alder ◽  
Room Temperature Ionic Liquids

scholarly journals Room Temperature Ionic Liquids in Asymmetric Hetero-Ene Type Reactions: Improving Organocatalyst Performance at Lower Temperatures

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 355
Author(s):  
Fabricio R. Bisogno ◽  
Rosario Fernández ◽  
Jose María Lassaletta ◽  
Gonzalo de de Gonzalo
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Catalyst Activity ◽  
Room Temperature Ionic Liquids ◽  
Tertiary Alcohols ◽  
Tert Butyl ◽  
Keto Esters ◽  
Enantioselective Addition ◽  
Positive Effect

Room temperature ionic liquids (RTILs) have been widely used as (co)solvents in several catalytic processes modifying, in most of the cases, the catalyst activity and/or the selectivity for the studied reactions. However, there are just a few examples of their use in hydrogen bonding organocatalysis. In this paper, we show the positive effect of a set of imidazole-based ionic liquids ([bmim]BF4 and [hmim]PF6) in the enantioselective addition of formaldehyde tert-butylhydrazone to prochiral α-keto esters catalyzed by a sugar-based chiral thiourea. Reactions performed in the presence of low percentages of RTILs led to an increase of the catalyst activity, thereby making possible to work at lower temperatures. Thus, the chiral tert-butyl azomethyl tertiary alcohols could be obtained with moderate to good conversions and higher enantioselectivities for most of the studied substrates when using up to 30 vol% of [hmim]PF6 as a cosolvent in processes performed in toluene.

Chemical Dynamics in Room-Temperature Ionic Liquids: The Role of Hydrogen Bonding

2010 ◽  
pp. 331-340
Author(s):  
Souravi Sarkar ◽  
Rajib Pramanik ◽  
Nilmoni Sarkar
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Chemical Dynamics

Anion Effect on Femtosecond OHD-RIKES and Raman Spectroscopy of Imidazolium-based Room-temperature Ionic Liquids

2013 ◽  
Vol 42 (1) ◽  
pp. 63-65 ◽  
Author(s):  
Rong Lu ◽  
Wei Wang ◽  
Shuwei Yuan ◽  
Anchi Yu
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Anion Effect

scholarly journals Effect of Counteranions on the Conformational Equilibrium of 1-Butyl-3-methylimidazolium-Based Ionic Liquids

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Naohiro Hatano ◽  
Takahiro Takekiyo ◽  
Hiroshi Abe ◽  
Yukihiro Yoshimura
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Conformational Equilibrium ◽  
Conformational Stability ◽  
Enthalpy Change ◽  
Room Temperature Ionic Liquids ◽  
Anion Effect ◽  
Anionic Species ◽  
Entropic Contribution

We have investigated the nonspherical anion effect on the trans-trans (TT) and gauche-trans (GT) equilibrium in pure 1-butyl-3-methylimidazolium ([bmim]+)-based room temperature ionic liquids (RTILs) by the Raman spectroscopy. The intensity ratio of the [bmim]+ cation in [bmim]+-based RTILs having nonspherical anions changes with nature of the anions. However, the enthalpy change of the [bmim]+ cation is approximately −1.0 kJ/mol for all [bmim]+-based RTILs used in this study and is independent of the anionic species. The present results indicate that the conformational stability of the [bmim]+ cation in [bmim]+-based RTILs including nonspherical anions is driven by the entropic contribution associated with the orientation and configuration of the [bmim]+ cation with respect to the counteranion.

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