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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Pyridinophane platform for stable lanthanide(III) complexation.

Goretti Castro1, Rufina Bastida, Alejandro Macías

  • 1Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain.

Inorganic Chemistry
|May 1, 2013
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Summary
This summary is machine-generated.

Lanthanide(III) complexes with the 2,11,20-triaza[3.3.3](2,6)pyridinophane (TPP) ligand exhibit distinct solid-state and solution structures. A structural transition occurs across the lanthanide series, impacting complex symmetry and conformation.

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Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Supramolecular Chemistry

Background:

  • Lanthanide(III) complexes are crucial in various applications, including catalysis and materials science.
  • Understanding their structural dynamics in both solid and solution states is key to designing novel functional materials.
  • The macrocyclic ligand 2,11,20-triaza[3.3.3](2,6)pyridinophane (TPP) offers a unique coordination environment for lanthanide ions.

Purpose of the Study:

  • To elucidate the solid-state and solution structures of lanthanide(III) complexes with the TPP ligand.
  • To investigate the structural evolution of these complexes across the entire lanthanide series.
  • To explore the conformational changes and symmetry of the TPP ligand upon complexation with different lanthanide ions.

Main Methods:

  • X-ray crystallography for solid-state structure determination of 14 Ln(3+) complexes.
  • (1)H and (13)C NMR spectroscopy for solution structure analysis.
  • Density Functional Theory (DFT) calculations (TPSSh model) in aqueous solution to complement experimental data.

Main Results:

  • Detailed solid-state structures reveal coordination by six nitrogen atoms of TPP, with anions and water completing the environment.
  • Solution structures, corroborated by DFT calculations and paramagnetic shifts, show a significant structural change at Sm(3+).
  • Larger lanthanide ions (La-Nd) form chiral complexes with dynamic enantiomeric interconversion (activation free energy of 33.0 kJ·mol(-1)), while heavier ions (Eu-Lu) adopt a half-chair conformation.

Conclusions:

  • The TPP ligand undergoes distinct conformational changes depending on the size of the complexed lanthanide ion.
  • These conformational changes lead to different symmetries and dynamic behaviors in solution across the lanthanide series.
  • The study provides fundamental insights into the structure-property relationships of lanthanide macrocyclic complexes.