✦ LIBER ✦

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

✍ Scribed by W. Libuś; D. Puchalska; R. Pastewski

Publisher: Elsevier Science
Year: 1980
Tongue: English
Weight: 668 KB
Volume: 25
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(80)80010-7

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✦ Synopsis

The molar conductivity curve and changes in the visible spectrum induced by changing concentrations have been determined for Cu(CF,COO), in dimethyl sulphoxide (DMSO) solution, at 25°C. Coupled with the spectra of the Cu(CIO,), + Bu,N CF,COO mixed solutions the results indicate occurence of the CuCF,COO* complex as the predominant copper species in thesolutions of Cu(CF,COO),. The next higher complex, Cu(CF&OO)z, is only formed at high concentrations of Cu(CF,COO), or under excess concentration of the CF,COO-anion. Formation of the first complex has also been studied callorimetrically, its derived thermodynamic characteristics being: K1 -' -697 + 12, AH" = (7.85 f 0.2) kJ/mol. and AS" = (80.6 + 1.6) J/K mol. at 25". On the other hand, K! 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,COO* complex is discussed.

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