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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Author Correction: Electronic energy levels and optical spectra of trivalent lanthanide ions in water - Ce(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III), Tm(III), and Yb(III).

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Testing lanthanide(III) complex stability using Eu(III) luminescence - documenting complex formation and stability in

Vasileios Mouchtouris1, Lea Gundorff Nielsen1, Thomas Just Sørensen1

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Summary

A new method using europium(III) luminescence quickly assesses lanthanide complex stability in solution. This technique is crucial for developing new diagnostic and therapeutic metal complexes, ensuring their reliability and safety for clinical applications.

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Area of Science:

  • Coordination Chemistry
  • Analytical Chemistry
  • Radiopharmaceutical Chemistry

Background:

  • Metal complexes are vital in medical diagnostics and therapy, with lanthanide(III) complexes already in clinical use.
  • The inherent lability of metal complexes necessitates robust methods for assessing the stability of novel compounds.
  • Established complexes like [Ln·DOTA]+ and [Ln·DTPA]2- serve as benchmarks for stability, with DOTA comparable to peptides and DTPA forming highly stable complexes.

Purpose of the Study:

  • To develop a rapid and straightforward method for evaluating the stability of lanthanide(III) complexes in solution.
  • To assess the stability of novel ligand systems (Kryptofix221, Kryptofix222, and macropa) using europium(III) luminescence.
  • To compare the performance of new complexes against known stable complexes like [Ln·DOTA]+ and [Ln·DTPA]2-.

Main Methods:

  • Utilized europium(III) luminescence as a direct reporter for complex formation and stability.
  • Investigated the stability of complexes formed by Kryptofix221, Kryptofix222, and macropa with lanthanide(III) ions.
  • Challenged the newly formed complexes with diethylenetriamine pentaacetic acid (DTPA) to assess their lability.
  • Determined solvation numbers (q) to further support the stability assessments.

Main Results:

  • Kryptofix221 and Kryptofix222 showed significant deviations from baseline complex formation, indicating poor complexation.
  • Macropa formed a distinct europium(III) complex, but subsequent challenge with DTPA revealed its lability in solution.
  • The results demonstrated that the tested novel ligand systems were less stable than anticipated or compared to benchmark complexes.

Conclusions:

  • The developed europium(III) luminescence-based method is a robust and user-friendly tool for assessing lanthanide complex stability.
  • The study highlights the importance of rigorous stability testing for new metal complexes intended for diagnostic or therapeutic applications.
  • Novel ligand systems must be carefully evaluated to ensure they form sufficiently stable complexes under physiological conditions.