Trimethylgallium

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Structural formula
Structural formula of trimethylgallium
General
Surname Trimethylgallium
other names
  • TMG
  • TMGa
Molecular formula C 3 H 9 Ga
Brief description

clear, colorless liquid

External identifiers / databases
CAS number 1445-79-0
EC number 215-897-6
ECHA InfoCard 100.014.452
PubChem 15051
Wikidata Q419426
properties
Molar mass 114.827 g mol −1
Physical state

liquid

boiling point

~ 55 ° C

Vapor pressure

193 hPa (20 ° C)

solubility

Reacts violently with water

safety instructions
GHS labeling of hazardous substances
02 - Highly / extremely flammable 05 - Corrosive

danger

H and P phrases H: 225-250-261-314
P: 210-222-231 + 232-280-305 + 351 + 338-422
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Trimethylgallium with the constitutional formula Ga (CH 3 ) 3 , also known as TMG or TMGa , is an organometallic compound of gallium .

presentation

Trimethylgallium can be obtained by reacting gallium trichloride with dimethylzinc at 120 ° C.

A reaction of methyl magnesium chloride with gallium trichloride in diethyl ether leads to trimethyl gallium monodiethyl etherate, the diethyl ether adduct of trimethyl gallium.

properties

At room temperature it is a clear, colorless liquid which is self-igniting in air and reacts violently with water. Trimethylgallium must be stored and handled in a dry protective gas atmosphere at temperatures below 25 ° C.

use

Trimethylgallium is used in the metal-organic gas phase epitaxy (MOVPE) as a gallium source for the production of compound semiconductors such as gallium phosphide (GaP), gallium arsenide (GaAs), gallium antimonide (GaSb), gallium nitride (GaN) and indium gallium nitride (In x Ga 1 − x N), which under among others in the field of optoelectronics are starting materials for the production of light emitting diodes .

Individual evidence

  1. a b c D. Shenaikhatkhate, R. Goyette, R. Dicarlojr, G. Dripps: Environment, health and safety issues for sources used in MOVPE growth of compound semiconductors. In: Journal of Crystal Growth. 272, 2004, pp. 816-821, doi : 10.1016 / j.jcrysgro.2004.09.007 .
  2. Hess, KL, Dapkus, PD, Manasevit, HM et al. An analytical evaluation of GaAs grown with commercial and repurified trimethylgallium. JEM 11, 1122 (1982). https://doi.org/10.1007/BF02658919 .
  3. a b c data sheet trimethylgallium from Sigma-Aldrich , accessed on November 22, 2011 ( PDF ).
  4. a b c C. A. Kraus; FE Toonder: Trimethyl gallium, Trimethyl gallium etherate and Trimethyl gallium ammine . In: PNAS . 19, No. 3, 1933, pp. 292-298. doi : 10.1073 / pnas.19.3.292 . PMID 16577510 . PMC 1085965 (free full text).