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Trimethylgallium

Trimethylgallium
Structural formula of trimethylgallium
Ball-and-stick model of trimethylgallium
Names
IUPAC name
trimethylgallane, trimethanidogallium
Identifiers
1445-79-0 YesY
3D model (Jmol) Interactive image
ChemSpider 14323 YesY
ECHA InfoCard 100.014.452
PubChem 15051
Properties
Ga(CH3)3
Molar mass 114.827 g/mol
Appearance clear colourless liquid
Melting point −15 °C (5 °F; 258 K)
Boiling point 55.7 °C (132.3 °F; 328.8 K)
Hazards
Main hazards pyrophoric
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY  (what is YesYN ?)
Infobox references

Trimethylgallium, Ga(CH3)3, often abbreviated to TMG or TMGa, is the preferred metalorganic source of gallium for metalorganic vapour phase epitaxy (MOVPE) of gallium-containing compound semiconductors, such as GaAs, GaN, GaP, GaSb, InGaAs, InGaN, AlGaInP, InGaP and AlInGaNP.

TMG is a clear, colorless, pyrophoric liquid. Even the hydrocarbon solutions of TMG, when sufficiently saturated, are known to catch fire on exposure to air. TMG is known to react violently with water and other compounds that are capable of providing labile and active hydrogen (i.e. protons). Therefore, TMG needs to be handled with care and caution, e.g. stored in a cool, dry place at 0-25 °C, under inert atmosphere, and ensuring that storage temperatures would not exceed 40 °C to avoid deterioration.

Trimethylgallium may be prepared by the reaction of dimethylzinc with gallium trichloride. The less volatile diethyl ether adduct can be prepared by using methylmagnesium iodide in ether in place of dimethylzinc; the ether ligands may be displaced with liquid ammonia as well.

The material is used in the production of LED lighting and semiconductors as a metalorganic chemical vapor deposition precursor.


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