Partial molar volumes and refractions of cobalt(III) complexes, part 2: Homologous series of nitrilopentaamminecobalt(III) complexes

摘要

Both the partial molar volumes (V-2m degrees) refractions (R-2m degrees ) of the solutes at infinite dilution have been determined at 20 degrees C for a series of six octahedral N-6-coordinated cobalt(III) species featuring five coordinated ammonia ligands along with a sixth N-coordinated organonitrile of increasing ligand size (from acetonitrile to sebaconitrile). The experimental values for V-2m degrees are consistent with the relative sizes of the ligands but show larger values than those generated by computer modeling as the size of the cation increases, presumably due to the void space of the cation which increases with the size of the nitrile ligand.