Equilibria of copper(II) acetate with acetylacetone in acetic acid and methanol solutions from optical and electron spin resonance measurements
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 69, 462-470
- https://doi.org/10.1039/f29736900462
Abstract
The equilibria of the reaction of copper acetate with acetylacetone in acetic acid and methanol solutions have been studied using e.s.r. and spectrophotometric measurements. In dry methanol the dimer dissociation constant KD=[CuAc2]2/[Cu2Ac4]≈ 6 × 10–3 M and the monomer dissociation constant KM=[CuAc+][Ac–]/[CuAc2]≈ 3 × 10–4 M (Ac–= acetate ion). Small additions of acetylacetone almost completely chelate with copper forming the mixed-ligand monomeric complex, CuAc(acac), and the bisacetylacetonate complex, Cu(acac)2. The mixed-ligand complex is slightly more stable than expected statistically. In acetic acid, however, only the bisacetylacetonate complex is formed according to the equilibrium Cu2Ac4+ 4Hacac 2Cu(acac)2+ 4HAc. The equilibrium constant, K=[Cu(acac)2]2/[Cu2Ac4], increases as log K= 2.6 + 3.72 log [Hacac].Keywords
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