Abstract
Complex formation of copper(II) with N,N-dimethylformamide(DMF) has been investigated calorimetrically in acetonitrile at 25°C. Calorimetric titration curves obtained are explained in terms of formation of [Cu(dmf) n ]2+ (n=1–4, 6) and their formation constants, enthalpies and entropies were determined. Formation of [Cu(dmf)5]2+ is uncertain. The stepwise enthalpies ΔS 03 and entropies ΔS 0n at each consecutive step are all negative except for ΔS 03 . The overall enthalpies of formation of [Cu(dmf)6]2+ is −(77.8±5.4) kJ-mol−1, which is compared with the enthalpy of transfer of copper(II) ion, ΔH ot =−79.7 kJ-mol−1, from acetonitrile to DMF.
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K. Ozutsumi, S. Ishiguro, and H. Ohtaki, to be published.
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Ishiguro, Si., Jeliazkova, B.G. & Ohtaki, H. A calorimetric study ofN,N-dimethylformamide complexes of copper(II) in acetonitrile. J Solution Chem 16, 1–10 (1987). https://doi.org/10.1007/BF00647009
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DOI: https://doi.org/10.1007/BF00647009