PMID- 21750789
OWN - NLM
STAT- MEDLINE
DCOM- 20111205
LR  - 20110805
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 13
IP  - 32
DP  - 2011 Aug 28
TI  - An enthalpic approach to delineate the interactions of cations of 
      imidazolium-based ionic liquids with molecular solvents.
PG  - 14715-22
LID - 10.1039/c1cp20888h [doi]
AB  - We present a systematic investigation on the enthalpic assessment of the 
      interactions operating between the cation and anion of four imidazolium ionic 
      liquids with aqueous and various nonaqueous solvents. Accurate experimental 
      information gathered with the help of an isothermal titration calorimeter at 
      298.15 K has been analyzed for excess partial molar enthalpy of the ionic liquid, 
      H(IL)(E), in terms of hydrophobic and solvation effects. The variations in the 
      limiting excess partial molar enthalpy of the ionic liquid, H(IL)(E, infinity), have 
      been correlated with solvent properties. We have quantified the enthalpic effects 
      due to dissociation of ionic liquids in very dilute solutions and to clathrate 
      formation with the increasing concentration of ionic liquid. A change in 
      enthalpic behavior from endothermic to exothermic is observed on increasing the 
      carbon chain length attached to the imidazolium ring. The solvent reorganization 
      around the cationic species has been unraveled by employing the ionic liquid 
      interaction parameters called as H(IL-IL)(E) deduced from the H(IL)(E) data. The 
      apparent relative molar enthalpy, phi(L), derived from H(IL)(E) data has been 
      examined in the light of the specific ion interaction theory as advanced by 
      Pitzer with accurate results.
FAU - Rai, Gitanjali
AU  - Rai G
AD  - Physical Chemistry Division, National Chemical Laboratory, Pune 411008, India.
FAU - Kumar, Anil
AU  - Kumar A
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110712
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
RN  - 0 (Cations)
RN  - 0 (Imidazoles)
RN  - 0 (Ionic Liquids)
RN  - 0 (Solvents)
SB  - IM
MH  - Cations/chemistry
MH  - Imidazoles/*chemistry
MH  - Ionic Liquids/*chemistry
MH  - Solvents/chemistry
MH  - *Thermodynamics
EDAT- 2011/07/14 06:00
MHDA- 2011/12/13 00:00
CRDT- 2011/07/14 06:00
PHST- 2011/07/14 06:00 [entrez]
PHST- 2011/07/14 06:00 [pubmed]
PHST- 2011/12/13 00:00 [medline]
AID - 10.1039/c1cp20888h [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2011 Aug 28;13(32):14715-22. doi: 10.1039/c1cp20888h. Epub 
      2011 Jul 12.