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Does GaH5 exist?

Lucas D Speakman1, Justin M Turney, Henry F Schaefer

  • 1Center for Computational Chemistry, University of Georgia, Athens, GA 30602, USA.

The Journal of Chemical Physics
|December 15, 2005
PubMed
Summary
This summary is machine-generated.

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Gallium pentahydride (GaH5) exists as a weakly bound complex of gallane and molecular hydrogen. Its structure and properties were computationally investigated, revealing insights into its stability and bonding characteristics.

Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Inorganic Chemistry

Background:

  • The existence and structure of gallium pentahydride (GaH5) have been a subject of debate.
  • Previous experimental and theoretical studies have not definitively characterized GaH5.

Purpose of the Study:

  • To systematically investigate the possible structures of gallium pentahydride (GaH5) using theoretical methods.
  • To determine the stability, vibrational frequencies, and energetic properties of various GaH5 isomers.

Main Methods:

  • Ab initio electronic structure theory was employed to study seven potential GaH5 structures.
  • High-level computational methods, including coupled cluster (CCSD) and basis sets (cc-pVXZ, aug-cc-pVXZ), were utilized.
  • Structures, vibrational frequencies, and dissociation energies were calculated.

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Main Results:

  • The most stable structure (1) is a weakly bound complex of gallane (GaH3) and molecular hydrogen (H2) with C(s) symmetry.
  • The calculated dissociation energy for GaH5 -> GaH3 + H2 is 2.05 kcal mol(-1).
  • A transition state for H2 rotation was found to be nearly degenerate with the complex, indicating free rotation.

Conclusions:

  • Gallium pentahydride (GaH5) is predicted to be a weakly bound complex, not a covalently bonded molecule.
  • Hydrogen scrambling is unlikely due to a high activation energy barrier.
  • The theoretical findings provide a detailed picture of GaH5's structure and stability.