Abstract
The equilibrium between unsaturated \(\beta \)-ketoester allyl acetoacetate and certain lanthanide ions (La3+, Pr3+, Nd3+, Sm3+, Gd3+, Ho3+, Er3+, Tm3+, Yb3+, Lu3+) was studied in mixed dioxane–water–ethyl acetate media. The formation of cationic 1:1 and 1:2 type complexes was shown and their formation constants were determined by potentiometric titration. For the 1:2 type complexes a molecular mechanics geometry optimization was performed and the bonding parameters were calculated on the basis of their electronic absorption spectra using the lanthanide aqua-ions as reference standards. The correlation between the nephelauxetic ratio and the relative metal–ligand bond length shortening due to the complexation was revealed and clarified.
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