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Erbium(III) in aqueous solution: an ab initio molecular dynamics study.

Lorenz R Canaval1, Theerathad Sakwarathorn, Bernd M Rode

  • 1Theoretical Chemistry Division Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck , Innrain 80-82, A-6020 Innsbruck, Austria.

The Journal of Physical Chemistry. B
|November 21, 2013
PubMed
Summary
This summary is machine-generated.

Quantum mechanical charge field molecular dynamics simulations reveal erbium(III) ion dynamics in water. Simulations show coordination numbers of eight and nine, with ligand exchange occurring on the picosecond timescale for both ground and excited states.

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Area of Science:

  • Computational chemistry
  • Solution chemistry
  • Spectroscopy

Background:

  • Understanding the behavior of lanthanide ions in aqueous solutions is crucial for various applications.
  • Erbium(III) ion properties are of interest due to its unique spectroscopic and magnetic characteristics.
  • Previous studies have provided limited insights into the dynamic and structural properties of erbium(III) in water.

Purpose of the Study:

  • To investigate the structural and dynamical properties of the erbium(III) ion in aqueous solution.
  • To compare the properties of erbium(III) in its ground and excited states.
  • To validate simulation results against experimental data.

Main Methods:

  • Ab initio quantum mechanical charge field molecular dynamics (QMCF-MD) simulations were employed.
  • Simulations were performed for both the ground and excited states of the erbium(III) ion.
  • UV/vis and Raman spectra, along with EXAFS data, were used for quality assessment.

Main Results:

  • Simulations indicate a mixture of coordination numbers eight and nine for the erbium(III) ion.
  • Ligand exchange on the picosecond timescale was observed in both ground and excited states.
  • The Er-ligand bond strength is weaker than for trivalent transition metals but stronger than for La(III) and Ce(III).

Conclusions:

  • The study provides detailed insights into the hydration structure and dynamics of erbium(III) in water.
  • Significant differences in ligand exchange rates were found between the ground and excited states.
  • Relativistic effects may account for minor discrepancies between simulation and experimental data.