Preparation and physicochemical characterization of anionic uranyl β-ketoenolates

Abstract

New classes of anionic uranyl β-ketoenolates of formula [UO₂L₂X]^–{L = 1,3-diphenylpropane-1,3-dionate (dppd), 4,4,4-trifluoro-1 -phenylbutane-1,3-dionate (tfpbd), or 1 -phenylbutane-1,3-dionate (pbd); X = Cl^–, Br^–, I^–, [NO₃]^–, [O₂CMe]^–, or [NCS]^–} and [L₂O₂U(µ-X)UO₂L₂]^–(X = F^–, and also Cl^– only in the case of L = dppd) have been synthesized and characterized by a number of physical measurements. The different ability of the various anionic ligands to enter into the co-ordination sphere of the uranyl ion, their potentially different bonding modes, and the possible correlations between physical parameters and the nature of either the chelate substituents or the anionic ligand are discussed.