257222

Trimethylaluminum

97%

• Synonym(s): Aluminum trimethanide, TMA
• Linear Formula: (CH₃)₃Al
• CAS Number: 75-24-1
• Molecular Weight: 72.09
• Beilstein: 3587197
• EC Number: 200-853-0
• MDL number: MFCD00008252
• PubChem Substance ID: 24855575
• NACRES: NA.23

Properties

• vapor pressure: 69.3 mmHg ( 60 °C)
• Quality Level: 200
• description: heat of vaporization: ~41.9 kJ/mol (dimer)
• Assay: 97%
• form: liquid
• reaction suitability: core: aluminum
• bp: 125-126 °C (lit.); 127 °C/760 mmHg; 20 °C/8 mmHg; 56 °C/50 mmHg
• mp: 15 °C (lit.)
• density: 0.752 g/mL at 25 °C (lit.)
• SMILES string: C[Al](C)C
• InChI: 1S/3CH3.Al/h3*1H3;
• InChI key: JLTRXTDYQLMHGR-UHFFFAOYSA-N

Description

General description

Trimethylaluminum (TMA) is the most reactive and volatile among all organoaluminium compounds. It is extremely pyrophoric. It acts as a highly reactive reducing and alkylating agent.

Application

TMA is used in a Ziegler Natta catalyst for polymerization and hydrogenation. TMA is mainly used for the production of methylaluminoxane, such as metalorganic chemical vapor deposition (MOCVD) of:

• Al₂O₃ using TMA and O₂ precursors.
• Al₄C₃ layers have been grown on Al₂O₃ (0001) using TMA and methane as source materials for aluminum and carbon.

Packaging

Supplied in a Sure/Pac^™ cylinder with a 1/4-turn bronze ball valve (Z122661) installed. This has a female 1/4"" NPT outlet thread and is closed with a male 1/4"" NPT carbon steel plug. The plug must be removed before use after ensuring the valve is in the closed position.

Compatible with the following:

• Aldrich^® Sure/Pac^™ station for liquefied gases Z566446
• PTFE Sealing tape Z104388 or Z221880
• Straight septum-inlet adapter Z118141 with septa Z565687 or Z565695

For instructions please refer to technical bulletin AL-136: The Aldrich Sure/Pac^™ Cylinder System

Other Notes

Storage below 20°C may cause crystallization.

Legal Information

Aldrich is a registered trademark of Sigma-Aldrich Co. LLC

Sure/Pac is a trademark of Sigma-Aldrich Co. LLC

Safety Information

• Pictograms: GHS02,GHS05
• Signal Word: Danger
• Hazard Statements: H250 - H260 - H314
• Precautionary Statements: P210 - P222 - P231 + P232 - P280 - P303 + P361 + P353 - P305 + P351 + P338
• Hazard Classifications: Pyr. Liq. 1 - Skin Corr. 1B - Water-react 1
• Supplementary Hazards: EUH014
• Storage Class Code: 4.2 - Pyrophoric and self-heating hazardous materials
• WGK: nwg
• Flash Point(F): No data available
• Flash Point(C): No data available
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves