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Beryllium Bonds, Do They Exist?

Manuel Yáñez1, Pablo Sanz1, Otilia Mó1

  • 1Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, E-28049-Madrid, Spain and Instituto de Química Médica, CSIC, Juan de la Cierva, 6, E-28006 Madrid, Spain.

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|December 4, 2015
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Summary

Researchers explored beryllium bonds (BeBs) in BeX2 complexes. These novel beryllium bonds are stronger than hydrogen bonds (HBs) and involve electron transfer, distorting the BeX2 molecule.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Supramolecular Chemistry

Background:

  • Beryllium dihalides (BeX2) can form complexes with Lewis bases.
  • Understanding non-covalent interactions is crucial in chemistry.
  • Hydrogen bonds (HBs) are well-studied intermolecular forces.

Purpose of the Study:

  • To investigate the nature of interactions between BeX2 and Lewis bases.
  • To characterize these interactions, termed 'beryllium bonds' (BeBs).
  • To compare the properties of BeBs with conventional hydrogen bonds (HBs).

Main Methods:

  • Theoretical calculations using B3LYP, MP2, and CCSD(T) methods.
  • Analysis of electron densities at bond critical points.
  • Evaluation of bonding indices and electron transfer pathways.

Main Results:

  • Complexes are stabilized by interactions between the beryllium atom and Lewis base.
  • Beryllium bonds exhibit higher electron densities at bond critical points than HBs.
  • BeBs are generally stronger than HBs, with dominant electrostatic and some covalent character.
  • Electron transfer occurs from Lewis base lone pairs to Be's empty p orbital and σ*BeX orbital.
  • BeX2 subunit distortion (nonlinear geometry), X-Be bond lengthening, and red-shifted antisymmetric stretching frequencies observed.
  • A significant blue-shift in the symmetric X-Be-X stretching frequency is noted.

Conclusions:

  • Beryllium bonds represent a distinct and strong non-covalent interaction.
  • These interactions share similarities with HBs but possess unique electron transfer mechanisms.
  • The formation of BeBs leads to significant structural and vibrational changes in the BeX2 moiety.