Abstract
The molar conductivity curve and changes in the visible spectrum induced by changing concentrations have been determined for Cu(CF 3COO) 2 in dimethyl sulphoxide (DMSO) solution, at 25°C. Coupled with the spectra of the Cu(ClO 4) 2 + Bu 4N CF 3COO mixed solutions the results indicate occurence of the CuCF 3COO + complex as the predominant copper(II) species in the solutions of Cu(CF 3COO) 2. The next higher complex, Cu(CF 3COO) 0 2, is only formed at high concentrations of Cu(CF 3COO) 2 or under excess concentration of the CF 3COO − anion. Formation of the first complex has also been studied callorimetrically, its derived thermodynamic characteristics being: K 0 1 = 697 ± 12, Δ H 0 = (7.85 ± 0.2) kJ/mol, and ΔS° = (80.6 ± 1.6) J/K mol, at 25°. On the other hand, K 0 2 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 CuCF 3COO + complex is discussed.
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