Solvation of praseodymium and cerium chlorides in anhydrous ethanol and n-propanol from ultrasonic velocity measurements

Ultrasonic velocities and densities were measured, and isentropic compressi bility coefficients calculated for solutions of anhydrous and hydrated CeCl 3 and PrCl3 in ethanol and n-propanol at 25 degreesC. The solvation numbers were calculated. The results were interpreted in terms of inner-sphere coo rdination of chloride anions by lanthanide cations, as well as changing dis sociation degree of the solutes with concentration. The steric effect of th e solvent molecules on modelling the structure and co-ordination number of metal ions was considered and compared with the X-ray diffraction of solid solvates. The above studies were correlated with our earlier optical invest igations [1]. (C) 2001 Elsevier Science B.V. All rights reserved.