N-base adducts of copper(II) β-diketone chelates and their role in solvent extraction

Abstract

Using a semi-micro colorimetric method the solvent extraction of copper(II) from acetate buffer by solutions of acetylacetone (Hacac) in benzene has been shown to be synergistically enhanced by the addition of N-bases. The order of synergistic extraction was found to be: 4-ethyl pyridine > isoquinoline > quinoline > 4-cyano pyridine > 2-benzoyl pyridine > 4-hydroxy pyridine. Formation constants of the extracted species Cu(acax) 2 quinoline and Cu(acac) 2 isoquinoline have been redetermined. Spectrophotometric studies in the visible region have been made on the systems [Display omitted] where A = the anion of acetylacetone (H acac), trifluoroacetylacetone (HTFA), thenoyltrifluoroacetone (HTTA) and hexafluoroacetylacetone (HHFA), B = quinoline and isoquinoline and x = 1 and or 2. Solid adducts have been prepared and investigated—those marked with an asterisk are reported for the first time: [Display omitted] . Room temperature magnetic moments of these compounds lie in the range 1·9-2·1 B.M. Their solid reflectance spectra have been compared to the absorption spectra in benzene solution.