Tracer diffusion of the tris(1,10-phenanthroline)iron(II) cation in aqueous salt solutions. Effect of hydrophobic interactions
Abstract
Tracer diffusion coefficients for the Fe(phen)32+ ion (phen = 1,10-phenanthroline) have been measured in aqueous solutions containing Ni(phen)3SO4, Bu4NBr, MgSO4 and NaBr, respectively, at 298.2 K. The diffusion coefficient–viscosity product, Dη, is found to decrease with increasing concentration of Ni(phen)3SO4, but the concentration dependence of Dη is very weak in other salt solutions. The results suggest the presence of cation–cation interactions between Fe(phen)32+ and Ni(phen)32+.