334901

Tetramethylammonium hydroxide solution

25 wt. % in methanol

• Synonym(s): N,N,N-trimethyl-methanaminium hydroxide, TMAH, TMAOH
• Linear Formula: (CH₃)₄N(OH)
• CAS Number: 75-59-2
• Molecular Weight: 91.15
• Beilstein: 3558708
• MDL number: MFCD00008280
• UNSPSC Code: 12352100
• PubChem Substance ID: 57648847
• NACRES: NA.21

Properties

• vapor pressure: 17.5 mmHg ( 20 °C)
• Quality Level: 200
• form: liquid
• concentration: 25 wt. % in methanol
• impurities: ≤10% water; ≤2% chloride
• density: 0.866 g/mL at 25 °C
• SMILES string: [OH-].C[N+](C)(C)C
• InChI: 1S/C4H12N.H2O/c1-5(2,3)4;/h1-4H3;1H2/q+1;/p-1
• InChI key: WGTYBPLFGIVFAS-UHFFFAOYSA-M

Description

General description

Tetramethylammonium hydroxide is a strong base used in the o-alkylation of phenolic and carboxylic OH groups.

Tetramethylammonium hydroxide is a quaternary ammonium salt generally used as an anisotropic etchant for silicon due to its high silicon etching rate.

Application

Tetramethylammonium hydroxide solution (25 wt.% solution in methanol) may be used in the synthesis of zirconium oxides via a modified sol-gel method with potential application as catalyst materials in CO hydrogenation.

Safety Information

• Pictograms: GHS02,GHS06,GHS08,GHS05
• Signal Word: Danger
• Hazard Statements: H226,H300 + H310,H314,H331,H370,H372,H412
• Precautionary Statements: P210 - P273 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 2 Dermal - Acute Tox. 2 Oral - Acute Tox. 3 Inhalation - Aquatic Chronic 3 - Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B - STOT RE 1 Dermal - STOT SE 1
• Target Organs: Eyes,Central nervous system, Liver,thymus
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 3
• Flash Point(F): 80.6 °F - closed cup
• Flash Point(C): 27 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves