31P and 35Cl PGSE Diffusion Studies on Phosphine Ligands and Selected Organometallic Complexes. Solvent Dependence of Ion Pairing

31 P and 35 Cl PGSE (pulsed gradient spin−echo) diffusion measurements on phosphine ligands and transition-metal complexes show that these nuclei can provide a useful complement to the existing 1 H and 19 F NMR forms of this experiment. The observed solvent dependence of the diffusion values in several palladium salts suggests that ion pairing is a major contributor in chloroform, important in methylene chloride, but small in acetone and methanol. A concentration dependence of the diffusion values is observed.