Abstract
Salting effects of the metal chelate electrolytes, [Fe(phen)3]Br2, [Fe(bpy)3]Br2, [Co(phen)3]Br3, [Co(en)3]Br3, and [Co(pn)3]Br3 (where phen= 1,10-phenanthroline, bpy=2,2′-bipridyl, en=ethylenediamine, and pn=1,2-propanediamine), as well as the tetraalkylammonium bromides (Bu4NBr and Pr4NBr), tetraphenylphosphonium bromide (Ph4PBr), sodium tetraphenylborate (NaBPh4), and sodium halides on the solubility of benzene and tris(acetylacetonato) cobalt (III) [Co(acac)3, where acac=CH3·CO·CH·CO·CH3-] in water at 15, 20, 25, and 35°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 [Fe(phen)3]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.
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Iwamoto, E., Tanaka, Y., Kimura, H. et al. Solute-solvent interactions with metal chelate electrolytes. Part III. Salting in of tris(acetylacetonato)cobalt(III) and benzene by aromatic and aliphatic ions. J Solution Chem 9, 841–856 (1980). https://doi.org/10.1007/BF00667997
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DOI: https://doi.org/10.1007/BF00667997