Abstract
By means of potentiometric studies evidence was found for the formation of 1:1:1 ternary chelates of the type:M(III)-DTPA-dicarboxylic acids [M(III)=La(III), Pr(III), Nd(III), Gd(III) or Dy(III); dicarboxylic acids = phthalic acid (PHA) or malonic acid (MLA)]. The formation constants (logK MLL ) and free energies of formation (ΔG°) have been evaluated. The order of stabilites with respect to the metal ions was La(III)<Pr(III)<Nd(III)<Gd(III)<Dy(III) and with respect to the dicarboxylic acidsMLA<PHA was observed.
Zusammenfassung
Es wurden ternäre 1:1:1-Chelate folgenden Typs mittels potentiometrischer Untersuchungen nachgewiesen:M(III)-DTPA-Dicarbonsäure [M(III)=La(III), Pr(III), Nd(III), Gd(III) oder Dy(III); Dicarbonsäure = Phthalsäure (PHA) oder Malonsäure (MLA)]. Die Komplexbildungskonstanten (K MLĹ) und die Bildungsenthalphien (ΔG°) wurden bestimmt. Bezüglich der Stabilität der Komplexe ergaben sich folgende Reihungen: La(III)<Pr(III)<Nd(III)<Gd(III)<Dy(III) bzw.MLA<PHA.
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Kumar, R., Sharma, R.C. & Chaturvedi, G.K. Mixed ligand chelates of some rare earth metals with diethylenetriamine-pentaacetic acid and dicarboxylic acids. Monatshefte für Chemie 110, 907–912 (1979). https://doi.org/10.1007/BF00906687
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DOI: https://doi.org/10.1007/BF00906687