Ionic association equilibria of copper(II) trifluoroacetate in dimethyl sulphoxide

Add time:09/27/2019    Source:sciencedirect.com

The molar conductivity curve and changes in the visible spectrum induced by changing concentrations have been determined for Cu(CF3COO)2 in dimethyl sulphoxide (DMSO) solution, at 25°C. Coupled with the spectra of the Cu(ClO4)2 + Bu4N CF3COO mixed solutions the results indicate occurence of the CuCF3COO+ complex as the predominant copper(II) species in the solutions of Cu(CF3COO)2. The next higher complex, Cu(CF3COO)02, is only formed at high concentrations of Cu(CF3COO)2 or under excess concentration of the CF3COO− anion. Formation of the first complex has also been studied callorimetrically, its derived thermodynamic characteristics being: K01 = 697 ± 12, ΔH0 = (7.85 ± 0.2) kJ/mol, and ΔS° = (80.6 ± 1.6) J/K mol, at 25°. On the other hand, K02 is only estimated as 13 ± 5. The results are compared with those previously obtained for the other divalent transition metal trifluoroacetates and the nature of the CuCF3COO+ complex is discussed.

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