Martin C, Sanchez F, Jimenez R, Prado R, Perez-Tejeda P, Lopez-Cornejo P
Department of Physical Chemistry, Faculty of Chemistry, University of Sevilla, c/Profesor García González s/n, 41012 Sevilla, Spain.
J Phys Chem B. 2006 Jul 6;110(26):12959-63. doi: 10.1021/jp060659c.
The influences of solvents (in water-cosolvent mixtures) and salts on the kinetics and thermodynamics of the inclusion of [Ru(NH3)5(4,4'-bpy)]2+ in beta-cyclodextrin (beta-CD) have been studied. Solvent effects on the kinetics can be described as a consequence of the competition of the cosolvent for the beta-CD cavity. The salt effects on the kinetics depend on the ion pairing of the anions with the [Ru(NH3)5(4,4'-bpy)]2+ complex. On the other hand, the solvent effects on the equilibrium constant depend on the stabilization of the 4,4'-bipyridine ligand in the water-cosolvent mixture relative to water. Finally, salt effects on the equilibrium constant are interpreted as a consequence of ion pairing between the anion of the salt and the inclusion complex.
