PREPARATION AND REACTIVITY OF METAL-CONTAINING MONOMERS .24. EQUILIBRIUM IN SOLUTIONS OF METAL(II) COMPLEXES WITH METHACROYLACETONE

Stability constants of Mg, Ca, Sr, Ba Mn, Co, Ni, Cu, and Zn complexes with the polymerizable ligand methacrylacetone have been determined in aqueous-dioxane solutions at an ionic strength of mu = 0.1 at 22-degrees-C. The methacroylacetone was shown to contain approximately 30% in the enol form using the pH-meter method. The stability sequence of the transition-metal complexes corresponds to the Irving - Williams stability series for ligands of low molecular weight; for the alkaline-earth metals the stability of the complexes increases with increase in ionic radius. Methacroylacetone-based chelates are significantly less stable than their analogs with unsubstituted acetylacetone.