@article { ISI:000281296900029, title = {Reversal from endothermic to exothermic behavior of imidazolium-based ionic liquids in molecular solvents}, journal = {Chemical Physics Letters}, volume = {496}, number = {1-3}, year = {2010}, month = {AUG}, pages = {143-147}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

In this communication, we present an interesting reversal in the enthalpic behavior from endothermic to exothermic on increasing the carbon chain length attached to the imidazolium ring in the imidazolium-based ionic liquids. A systematic investigation is presented on the excess partial molar enthalpy, H(IL)(E) directly measured using isothermal titration calorimeter at 298.15 K for the interactions operating between cation and anion of four imidazolium ionic liquids with aqueous and various non-aqueous solvents. This reversal behavior is analyzed in terms of hydrophobic and solvation effects. (C) 2010 Published by Elsevier B.V.

}, issn = {0009-2614}, doi = {10.1016/j.cplett.2010.07.056}, author = {Rai, Gitanjali and Kumar, Anil} }