Solute-Solvent Interactions with Metal Chelate Electrolytes. Part III. Salting in of Tris(acetylacetonato)cobalt(III) and Benzene by Aromatic and Aliphatic Ions

Article abstract of DOI:10.1007/BF00667997

Salting effects of the metal chelate electrolytes, Br2, Br2, Br3, Br3, and Br3 (where phen = 1,10-phenanthroline, bpy = 2,2'-bipyridyl, en = ethylenediamine, and ph 1,2-propanediamine), as well as the tetraalkylammoniumbromides (Bu4NBr and Pr4NBr), tetraphenylphosphonium bromide (Ph4PBr), sodium tetraphenylborate (NaBPh4), and sodium halides on the solubility in benzene and tris (acetylacetonato) cobalt(III) in water at 15, 20, 25, and 35 deg C were studied, and the transfer free energies of the nonelectrolytes from pure water to the electrolyte solutions were obtained.Co(acac)3 is strongly salted in by Br2, NaBPh4, and Ph4PBr with large positive transfer enthalpies and entropies, weakly salted in by Bu4NBr and Pr4NBr with much less positive enthalpies and entropies and is salted out by the other electrolytes.The differences between salting effects of aromatic and aliphatic ions are discussed using the transfer enthalpy-entropy relation.