Aqueous Mixtures of Room-Temperature Ionic Liquids: Entropy-Driven Accumulation of Water Molecules at Interfaces

2019 ◽  
Vol 123 (22) ◽  
pp. 13795-13803 ◽  
Author(s):  
Takeshi Kobayashi ◽  
Andre Kemna ◽  
Maria Fyta ◽  
Björn Braunschweig ◽  
Jens Smiatek
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Water Molecules ◽  
Aqueous Mixtures

Absorption of Water by Room-Temperature Ionic Liquids: Effect of Anions on Concentration and State of Water

2003 ◽  
Vol 57 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Chieu D. Tran ◽  
Silvia H. De Paoli Lacerda ◽  
Daniel Oliveira
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Near Infrared ◽  
Room Temperature Ionic Liquids ◽  
Water Molecules ◽  
Structure Of Water ◽  
State Of Water

Near-infrared (NIR) spectrometry was successfully used for the noninvasive and in situ determination of concentrations and structure of water absorbed by room-temperature ionic liquids (RTILs). It was found that RTILs based on 1-butyl-3-methylimidazolium, namely, [BuMIm]+[BF4]−, [BuMIm]+[bis((trifluoromethyl)sulfonyl)amide, or Tf2N]− and [BuMIm]+[PF6]−, are hydroscopic and can quickly absorb water when they are exposed to air. Absorbed water interacts with the anions of the RTILs, and these interactions lead to changes in the structure of water. Among the RTILs studied, [BF4]− provides the strongest interactions and [PF6]− the weakest. In 24 hours, [BuMIm]+[BF4]− can absorb up to 0.320 M of water, whereas [BuMIm]+[PF6]− can only absorb 8.3 × 10−2 M of water. It seems that higher amounts of water can be absorbed when the anion of the RTIL can strongly interact and hence stabilize absorbed water molecules by forming hydrogen bonds with them or inducing hydrogen bonds among water molecules. More importantly, the NIR technique can be sensitively used for the noninvasive, in situ determination of absorbed water in RTILs, without any pretreatment, and at limits of detection as low as 3.20 × 10−3 M.

scholarly journals Structure and dynamics of room temperature ionic liquids with bromide anion: results from 81 Br NMR spectroscopy

2015 ◽  
Vol 53 (5) ◽  
pp. 369-378 ◽  
Author(s):  
Takatsugu Endo ◽  
Mamoru Imanari ◽  
Yuki Hidaka ◽  
Hiroko Seki ◽  
Keiko Nishikawa ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Nmr Spectroscopy ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Bromide Anion ◽  
Structure And Dynamics

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...

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