SELF-DIFFUSION MEASUREMENTS OF POLYCYCLIC AROMATIC HYDROCARBON ALKALI-METAL SALTS

The solvations of various polycyclic aromatic hydrocarbon alkali metal salts are studied using their self-diffusion rates measured by NMR sp ectroscopy. The moiety size is more dependent on the anion than the ca tion, The self-diffusion rates of the neutral compounds are found to b e predictable while the salts diffuse considerably slower than the uns olvated species indicating the presence of a solvent shell. The appare nt moiety size is temperature dependent for the salts in ethereal solu tions indicating a solvation shell of varying size.