Dependence of the stability of lanthanide β-dicarbonyl complexes on the metal—ligand bond energy
DOI:
https://doi.org/10.15407/dopovidi2019.04.074Keywords:
formation constants, ionic bonding, lanthanide complexes, semiempirical calculations, β-dicarbonyl ligandsAbstract
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.
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