@article { ISI:000259381200014, title = {Unusual temperature dependence of salt effects for {\textquoteleft}{\textquoteleft}on water{\textquoteright}{\textquoteright} wittig reaction: hydrophobicity at the interface}, journal = {Chemical Communications}, number = {37}, year = {2008}, month = {MAY}, pages = {4445-4447}, publisher = {ROYAL SOC CHEMISTRY}, type = {Article}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

An unusual variation with temperature of the salt effects in aqueous Wittig reaction is observed, suggesting that hydrophobic acceleration of reactions comprising {\textquoteleft}{\textquoteleft}on water{\textquoteright}{\textquoteright} reactants is fundamentally different from that for reactions with small non-polar solutes.

}, issn = {1359-7345}, doi = {10.1039/b809127g}, author = {Tiwari, Shraeddha and Kumar, Anil} } @article { ISI:000327418000001, title = {Unusual salting effects in ionic liquid solutions}, journal = {Indian Journal of Chemistry Section A-Inorganic Bio-Inorganic Physical Theoretical \& Analytical Chemistry}, volume = {52}, number = {11}, year = {2013}, month = {NOV}, pages = {1377-1382}, publisher = {NATL INST SCIENCE COMMUNICATION-NISCAIR}, address = {DR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIA}, abstract = {

Unusual salting effects of salting-out agents like LiCl and NaCl and salting-in agents like LiClO4 and NaClO4 in ionic liquid solutions are reported. It is observed that the salting behavior in water can be altered in the presence of ionic liquids. It is demonstrated that the salting-in agents in the presence of the ionic liquids with higher alkyl chain can display unusual fall and rise in the viscosity of the systems. On the other hand, no change in the behavior of the salting-out agents is noted in these ionic liquids. A tentative explanation is proposed for the observed viscosity data in these systems.

}, keywords = {Cationic ring, ionic liquids, Salting effects, viscosity}, issn = {0376-4710}, author = {Nanda, Raju and Kumar, Anil} } @article { ISI:000382107200047, title = {Understanding positive and negative deviations in polarity of ionic liquid mixtures by pseudo-solvent approach}, journal = {Physical Chemistry Chemical Physics}, volume = {18}, number = {34}, year = {2016}, month = {SEP}, pages = {23853-23863}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Physico-chemical properties of liquid mixtures in general display large deviations from linear behaviour, arising out of complex specific and non-specific intermolecular interactions. The polarity of liquid mixtures displaying large positive and negative deviations can be minimized and linear mixing can be achieved in liquids using a pseudo-solvent methodology. The work described herein is designed to investigate the influence of different physical parameters on the linear pseudo-solvent composition in ionic liquid mixtures. For this purpose, we have determined the deviations from linearity, Delta E-T(N) values (defined as Delta E-T(N) = E-Texp.(N) - E-Tlin mix.(N) with E-Tlin mix.(N) given by Sigma(n)(i=0) E-Ti(N0) x(i)) for binary mixtures of a variety of ionic liquids, including two molecular solvents, DMSO and formamide. Firstly, the investigations were carried out in three 1-butyl-3-methylimidazolium cation based aprotic ionic liquids and the roles of anionic structure and hydrogen bond acceptor basicities (beta values) of the ionic liquids were determined. The influence of the cationic structure, i.e., the hydrogen bond donor acidity (alpha values) and non-associative nature of the ionic liquids, was determined using C2-methylated analogs, 1-butyl-2,3-dimethylimidazolium cation based ionic liquids. The role of the protic nature of ionic liquids was studied in two protic ionic liquids, viz., 1-methylimidazolium formate and 1-methylimidazolium acetate. The effects of the temperature, pseudo-solvent structure and solvatochromic probe structure on the Delta E-T(N) values were also explored.

}, issn = {1463-9076}, doi = {10.1039/c6cp04440a}, author = {Beniwal, Vijay and Kumar, Anil} }