trimethylgallium

Trimethylgallium, often abbreviated to TMG or TMGa, is the organogallium compound with the formula Ga(CH3)3. It is a colorless, pyrophoric liquid. Unlike trimethylaluminium, TMG adopts a monomeric structure. When examined in detail, the monomeric units are clearly linked by multiple weak Ga---C interactions, reminiscent of the situation for trimethylindium.

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It sits within the topics Chemical vapour deposition precursors, ECHA InfoCard ID from Wikidata and Gallium compounds.

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Chemical data

Formula: C3H9Ga
Molecular weight: 114.83 g/mol
IUPAC name: trimethylgallane
SMILES: C[Ga](C)C
InChIKey: XCZXGTMEAKBVPV-UHFFFAOYSA-N
Polar surface area: 0 Å²
H-bond donors: 0
H-bond acceptors: 0
Formal charge: 0

via PubChem

Wikidata facts

Subclass of: chemical compound
Has part: carbon
Mass: 113.995999

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canonical SMILES: C[Ga](C)C
chemical formula: C₃H₉Ga
Commons category: Trimethylgallium
boiling point: 55.7

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Encyclopedic overview

3 sections

Contents

Preparation
Applications
References

==Preparation== Two forms of TMG are typically investigated: Lewis base adducts or TMG itself. All are prepared by reactions of gallium trichloride with various methylating agents. When the methylation is conducted with methylmagnesium iodide in diethyl ether, the product is the poorly volatile diethyl ether adduct. As noted by TMG discoverers Kraus and Toonder in 1933, the ether ligand is not readily lost, although it may be displaced with liquid ammonia. When the alkylation is conducted with methyl lithium in the presence of a tertiary phosphine the air-stable phosphine adduct is obtained:

Excerpted from Wikipedia’s “trimethylgallium” article, available under the CC BY-SA 4.0 licence.