Viscosity B-coefficients of tetraalkylammonium iodides, sodium iodide and sodium tetraphenylborate in dimethyl sulphoxide + water mixtures at 298, 308 and 318 K

Abstract

The relative viscosities of solutions of tetraalkylammonium iodides, R₄NI (where R = CH₃–, C₂H₅–, C₃H₇– and C₂H₉–) have been measured in dimethyl sulphoxide (DMSO) + water mixtures (20, 40, 60, 80 and 100 wt% of DMSO) at 298, 308 and 318K. The results have been analysed using the Jones-Dole equation and the viscosity <em>B</em>-coefficients have been calculated. The <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0>μ<img src='http://www.niscair.res.in/jinfo/equation159.gif' border=0>^ǂ, <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0><em>H</em><img src='http://www.niscair.res.in/jinfo/equation159.gif' border=0>^ǂ and T<img src='http://www.niscair.res.in/jinfo/delta.gif' border=0><em>S</em><img src='http://www.niscair.res.in/jinfo/equation159.gif' border=0>^ǂ values of the salts have been determined using the transition state treatment and the temperature coefficient measurements. The ionic <em>B</em>-values and other single ion parameters have been determined using Bu₄NBPh₄ as the 'reference electrolyte'. The results have been discussed in terms of the structural changes of the solvents and preferential solvation of ions.