Dependence of the stability of lanthanide β-dicarbonyl complexes on the metal—ligand bond energy

TitleDependence of the stability of lanthanide β-dicarbonyl complexes on the metal—ligand bond energy
Publication TypeJournal Article
Year of Publication2019
AuthorsMishchenko, AM, Trunova, EK
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
Date Published04/2019

The formation constants of the lanthanide complexes with acetylacetone, methyl, and ethyl acetoacetate are determined by pH-potentiometric titration in a water-ethanol solution. Their stability is shown to correlate with the energy of the metal–ligand ionic bond calculated using the semiempirical Sparkle/PM7 method. Higher values of the overall formation constants of the lanthanide complexes with β-ketoesters are caused by the strengthening of the metal–ligand electrostatic interaction due to an increase of the negative charge on the ligand carbonyl oxygen atoms.

Keywordsformation constants, ionic bonding, lanthanide complexes, semiempirical calculations, β-dicarbonyl ligands

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