Abstract
Abstract Formation constants and thermodynamic parameters for the 1: 1 adduct-formation reactions of bis(trifluoroacetylacetonato)copper(II), Cu(tfac)2, with alkylamines, α-picoline, 2,6-lutidine, and THF have been determined spectrophotometrically. The ΔH°–ΔS° plots for primary and secondary alkylamines gave a linear relationship for the thermodynamic parameters of the Cu(tfac)2-heterocyclic base systems. The plots for the 2,6-lutidine, THF and tertiary alkylamine systems have been found consistent with a correlation between ΔH° and ΔS° values for bis(acetylacetonato)copper(II)–heterocyclic base systems. It has been subsequently deduced that the 1: 1 adducts of Cu(tfac)2 with Lewis bases possess a square-pyramidal structure on the basis of the ESR data for the 63Cu(tfac)2–Lewis base systems.
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