01993nas a2200157   4500008004100000022001400041245012300055210006900178260011000247300001600357490000700373520129700380100001901677700001601696856012301712       2011                        eng d  a1463-907600aEnthalpic approach to delineate the interactions of cations of imidazolium-based ionic liquids with molecular solvents0 aEnthalpic approach to delineate the interactions of cations of i  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN  a14715-147220 v133 a<p>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.</p>1 aRai, Gitanjali1 aKumar, Anil  uhttps://library.ncl.res.in/content/enthalpic-approach-delineate-interactions-cations-imidazolium-based-ionic-liquids-0