02184nas a2200157   4500008004100000022001400041245014000055210006900195260007100264300001400335490000800349520150200357100002501859700001601884856012601900       2013                        eng d  a1520-610600aProbing the acidity of carboxylic acids in protic ionic liquids, water, and their binary mixtures: activation energy of proton transfer0 aProbing the acidity of carboxylic acids in protic ionic liquids   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB  a2456-24650 v1173 a<p>Acidity functions were used to express the ability of a solvent/solution to donate/accept a proton to a solute. The present work accounts for the acidity determination of HCOOH, CH3COOH, and CH3CH2COOH in the alkylimidazolium-based protic ionic liquids (PILs), incorporated with carboxylate anion, water, and in a binary mixture of PIL and water using the Hammett acidity function, H-0. A reversal in the acidity trend was observed, when organic acids were transferred from water to PIL. It was emphasized that an increased stabilization offered by PIL cation toward the more basic conjugate anion of organic acid was responsible for this anomalous change in acidity order in PILs, which was absent in water. The greater stabilization of a basic organic anion by PIL cation is discussed in terms of the stable hard-soft acid base (HSAB) pairing. A change in the H-0 values of these acids was observed with a change in temperature, and a linear correlation between the ln H-0 and 1/T was noted. This relationship points toward the activation energy of proton transfer (E-a,E-H+), a barrier provided by the medium during the proton transfer from Bronsted acid to indicator. The H-0 function in binary mixtures points to the involvement of pseudosolvent, the behavior of which changes with the nature and concentration of acid. The presence of the maxima/minima in the H-0 function is discussed in terms of the synergetic behavior of the pseudosolvent composed of the mixtures of aqueous PILs.</p>1 aShukla, Shashi, Kant1 aKumar, Anil  uhttp://library.ncl.res.in/content/probing-acidity-carboxylic-acids-protic-ionic-liquids-water-and-their-binary-mixtures-001242nas a2200157   4500008004100000022001400041245005400055210005400109260005700163300001400220490000700234520071500241100002500956700001600981856008700997       2015                        eng d  a1618-954X00aPolarity issues in room temperature ionic liquids0 aPolarity issues in room temperature ionic liquids  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcAPR  a1111-11160 v173 a<p>The study on ionic liquids has occupied an important place in chemical processes because of several beneficial properties. In order to use these ionic liquids as solvent media in chemical processes, it is essential to know their solvent properties. In this review, an attempt has been made to critically evaluate and discuss the polarity parameters of ionic liquids. The experimental polarity data on ionic liquids are not yet available for numerous ionic liquids. This review will serve as a guideline to investigate polarity issues of these materials and emerge with a simple, but still sound theoretical or semi-empirical models to account for the variation in polarity in the ionic liquid solutions.</p>1 aShukla, Shashi, Kant1 aKumar, Anil  uhttp://library.ncl.res.in/content/polarity-issues-room-temperature-ionic-liquids-0