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Related Experiment Videos

Hydrogen multicentre bonds.

Anderson Janotti1, Chris G Van de Walle

  • 1Materials Department, University of California, Santa Barbara, California 93106-5050, USA. ajanotti@mrl.ucsb.edu

Nature Materials
|December 5, 2006
PubMed
Summary
This summary is machine-generated.

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Researchers discovered hydrogen multicentre bonds, where hydrogen atoms bond to four or more atoms, challenging traditional bonding theories. These strong, novel bonds explain phenomena in metal oxides like ZnO and MgO.

Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Solid-State Physics

Background:

  • Chemical bonding theories evolved from classical electron pairs to quantum mechanics.
  • Existing models include covalent, ionic, van der Waals, metallic, hydrogen, and three-centre bonds.
  • These models explain most molecular and solid structures.

Purpose of the Study:

  • To present evidence for hydrogen multicentre bonds, a generalization of three-centre bonds.
  • To investigate the bonding behavior of hydrogen in metal oxides.
  • To explain electrical conductivity phenomena in ZnO and MgO.

Main Methods:

  • Theoretical calculations of hydrogen bonding in metal oxides.
  • Analysis of hydrogen coordination in Zinc Oxide (ZnO) and Magnesium Oxide (MgO).

Related Experiment Videos

  • Comparison of calculated vibrational frequencies with infrared spectroscopy data.

    • Main Results:

    • Evidence for hydrogen atoms bonding equally to four or more metal atoms (multicentre bonds).
    • Hydrogen becomes fourfold coordinated in ZnO and sixfold coordinated in MgO.
    • These bonds are strong despite large hydrogen-metal distances.
    • Calculated frequencies match experimental infrared spectroscopy data for MgO.

    Conclusions:

    • Hydrogen multicentre bonds represent a significant extension of chemical bonding concepts.
    • This bonding explains the role of hydrogen in the electrical conductivity of metal oxides.
    • Resolves long-standing questions about unintentional n-type conductivity in ZnO.