Physico-chemical Studies of Solvation Behaviour of Some Chromium (III) Complexes in Nitromethane and Dimethyl Sulfoxide at 298.15, 308.15 and 318.15 K

Abstract

Viscosity () and molar conductance () of (C4H9)4NBPh4, (C4H9)4NClO4, NH4X,(C3H7)4NX and (C4H9)4NX (X= [Cr(NCS)4(NH3)2]-) have been measured in nitromethane (NM) and dimethylsulphoxide (DMSO) at 298.15, 308.15 and 318.15 K temperatures at various salt concentrations. The ultrasonic velocity data has been analysed to obtain limiting apparent molal isentropic compressibility (o s K  ,) of the electrolytes. The viscosity data has been analyzed by Jones-Dole equation to evaluate viscosity B-coefficients. The conductance data has been analysed by the Shedlovsky method to evaluate Λo and KA. The derived limiting parameters were split into the ionic contributions of the salts using which the limiting ionic apparent molal isentropic compressibility (o s K  ,)±, viscosity B± coefficients and solvated radii (ri) of various ions have been evaluated. Isentropic compressibility results show that all these ions possess weak interaction with different solvents involving solvophobic interactions. The A-coefficients are in reasonable good agreement with the limiting theoretical values (A) calculated using Falkenhagen-Vernon equation. Viscosity B± coefficients confirm the existence of interactions of the complex with the solvent molecules. The ion-solvent interactions are confirmed by the solvated radii (ri) values of the ions determined from the molar conductance.