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Stabilities of Ac3+ Complexes Relevant as Radiopharmaceuticals.

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Density functional theory reveals that Actinium-225 (Ac-225) complexes generally exhibit lower thermodynamic stability than Lanthanum-225 (La-225) complexes, guiding radiopharmaceutical design for targeted alpha therapy.

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Area of Science:

  • Radiopharmaceutical Chemistry
  • Computational Chemistry
  • Nuclear Medicine

Background:

  • Lanthanum (La3+) and Actinium (Ac3+) ions are crucial in developing radiopharmaceuticals.
  • Understanding their coordination chemistry is vital for designing effective therapeutic agents.
  • Ac-225 is a promising radionuclide for targeted alpha therapy (TAT).

Purpose of the Study:

  • To investigate the structural and thermodynamic properties of La3+ and Ac3+ complexes using DFT.
  • To identify suitable chelators for Ac-225 based radiopharmaceuticals.
  • To establish a computational method for predicting Ac3+ complex stability.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Energy Decomposition Analysis (EDA) for metal-ligand interactions.
  • Thermodynamic DFT studies to estimate stability constants.

Main Results:

  • Ac3+ coordination environments show systematically longer bond distances than La3+.
  • Estimated ionic radius for Ac3+ (coordination number 9) is 1.275 ± 0.020 Å.
  • Ac3+ complexes generally exhibit lower thermodynamic stability compared to La3+ complexes, with exceptions like MACROPA2- and OCTAPA4-.

Conclusions:

  • The DFT methodology can accurately predict Ac3+ complex stability relative to La3+.
  • Chelators like MACROPA2- and OCTAPA4- show potential for Ac-225 complexation.
  • This work aids in designing novel radiopharmaceuticals for targeted alpha therapy using Ac-225.