Pentamagnesium digallide

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Pentamagnesium digallide
Names
IUPAC name
Pentamagnesium digallide
Other names
  • Magnesium gallide(−V)
Identifiers
3D model (
JSmol
)
  • InChI=1S/2Ga.5Mg
    Key: BHKRUXZCMMTJBB-UHFFFAOYSA-N
  • [Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Ga-5].[Ga-5]
Properties
Mg5Ga2
Molar mass 260.97 g/mol
Appearance White crystalline solid
Density 3.08 g/cm3
Melting point 456 °C (853 °F; 729 K)
Structure
Orthorhombic
Ibam
mmm
a = 13.71 Å, b = 7.02 Å, c = 6.02 Å
579.06 Å3
Thermochemistry
Std enthalpy of
formation
(ΔfH⦵298)
 -206.5 kJ/mol (calculated)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Pentamagnesium digallide, also known as magnesium gallide(−V), is a chemical compound in the family of magnesium gallides (MgxGay). This compound has gallium in the rare oxidation state −5 and is produced by splat quenching of a molten mixture of magnesium and gallium metal then heating the resulting substance to 350 °C:[1][2]

5Mg + 2Ga → Mg5Ga2

It is an unwanted product when magnesium-gallium alloys are exposed to high temperatures.[3]

References

  1. doi:10.1016/0022-5088(79)90207-8
    .
  2. ^ Patrick Hofmann. "Colture. Ein Programm zur interaktiven Visualisierung von Festkörperstrukturen sowie Synthese, Struktur und Eigenschaften von binären und ternären Alkali- und Erdalkalimetallgalliden" (PDF) (in German). p. 72.
  3. doi:10.1016/S1002-0071(12)60028-8
    .
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