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Related Experiment Videos

Be(II) in aqueous solution--an extended ab initio QM/MM MD study.

Alessandro D'Incal1, Thomas S Hofer, Bernhard R Randolf

  • 1Theoretical Chemistry Division, Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria.

Physical Chemistry Chemical Physics : PCCP
|June 16, 2006
PubMed
Summary

Beryllium(II) hydration shells exhibit distinct dynamics. The inner hydration shell is inert, while outer shells show rapid water exchange, indicating stable Be-O bonds.

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Area of Science:

  • Computational chemistry
  • Solution chemistry
  • Biophysical chemistry

Background:

  • Understanding ion-hydrate structures is crucial for chemical and biological processes.
  • Beryllium(II) ion's hydration properties are not fully characterized.
  • Quantum mechanical/molecular mechanical (QM/MM) methods offer insights into complex systems.

Purpose of the Study:

  • To investigate the structural and dynamical properties of the beryllium(II)-hydrate in aqueous solution.
  • To elucidate the hydration shell dynamics and ligand exchange processes.
  • To evaluate the stability of the beryllium-ligand bond.

Main Methods:

  • Ab initio quantum mechanical/molecular mechanical (QM/MM) molecular dynamics (MD) simulations.
  • Simulations performed at double-zeta restricted Hartree-Fock (RHF) level at 293.15 K.

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  • Inclusion of first and second hydration shells in the QM region.

    • Main Results:

    • The first hydration shell (tetrahedral, 4 water molecules, 1.61 Å) is highly inert to ligand exchange.
    • Outer hydration shells (second: ~9.2 waters, 3.7 Å; third: ~19 waters, 5.4 Å) exhibit rapid water exchange.
    • Mean residence times for second and third shell ligands are 4.8 ps and 3.2 ps, respectively.
    • Be-O stretching frequency (658 cm⁻¹) suggests exceptional ion-ligand bond stability.

    Conclusions:

    • The beryllium(II) ion forms a stable inner hydration shell with limited water exchange.
    • Outer hydration shells are dynamic, facilitating rapid exchange with bulk water.
    • Computational simulations provide valuable insights into the stability and dynamics of metal ion hydrates.