Abstract
The molar enthalpies of transfer Δt H ° of some divalent metal ions (M-Mn, Co, Ni and Zn) and their chloro complexes from N,N-dimethyl-for-mamide (DMF) to N,N-dimethylacetamide (DMA) have been determined using the tetraphenylarsonium-tetraphenylborate (TATB) assumption at 25°C. Although physicochemical properties of DMF and DMA as solvent are similar, the Δt H °(M 2+) value increased significantly in the order Mn<Co<Ni<Zn. The corresponding Δt H ° values for the mono-and dichloro complexes showed also a strong metal dependence, while those for the triand tetrachloro complexes practically do not. These results can be reasonably explained in terms of steric hindrance upon solvation of the metal ions and complexes in DMA.
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Koidel, M., Ishiguro, Si. Molar enthalpies of transfer of divalent transition metal lons and their chloro complexes from N,N-dimethylformamide to N,N-dimethylacetamide. J Solution Chem 24, 511–522 (1995). https://doi.org/10.1007/BF01004481
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DOI: https://doi.org/10.1007/BF01004481