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Tetramethylammonium hydroxide

CAS No.75-59-2
Chemical Name:Tetramethylammonium hydroxide
CBNumber:CB2854236
Molecular Formula:C4H13NO
Formula Weight:91.15
MOL File:75-59-2.mol

Tetramethylammonium hydroxide Property

Melting point °C
Boiling point 110 °C
Density 0.866 g/mL at 25 °C
vapor pressure 17.5 mm Hg ( 20 °C)
refractive index n20/D 1.384
Flash point 80 °F
storage temp. Store below +30°C.
solubility Methanol (Sparingly), Water (Slightly)
form Solution
color APHA: ≤10
Odor strong ammonia-like odor
PH >13 (H2O, 20°C)
Water Solubility Soluble in water.
Sensitive Air Sensitive
Merck 14,9224
BRN 3558708
Stability Stable. Flammable. Incompatible with strong oxidizing agents, strong acids.
InChIKey WGTYBPLFGIVFAS-UHFFFAOYSA-M
CAS DataBase Reference 75-59-2(CAS DataBase Reference)
FDA UNII 5GKP7317Q2
EPA Substance Registry System Tetramethylammonium hydroxide (75-59-2)
UNSPSC Code 12352107
NACRES NA.21

Safety

Hazard Codes :C,T,F,T+,Xn
Risk Statements :24/25-34-20/21/22-39/23/24/25-23/24/25-10-21/22-25-21-11-67-36-52-48/24-27/28-23-35-36/38
Safety Statements :45-36/37/39-26-16-36/37-28
RIDADR :UN 3286 3/PG 2
WGK Germany :1
RTECS :PA0875000
F :4.4-10-34
TSCA :Yes
HazardClass :3
PackingGroup :II
HS Code :29239000
Hazardous Substances Data :75-59-2(Hazardous Substances Data)

NFPA 704:

	1
3		0

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordDanger
Hazard statements H226-H300+H310-H314-H331-H370-H372-H412
Precautionary statements P210-P273-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338

Tetramethylammonium hydroxide Price More Price(55)

Brand: Sigma-Aldrich(India)
Product number: 8.14748
Product name : Tetramethylammonium hydroxide
Purity: (25% solution in water) for synthesis
Packaging: 250ML
Price: ₹20420
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 8.14748
Product name : Tetramethylammonium hydroxide
Purity: (25% solution in water) for synthesis
Packaging: 1L
Price: ₹37119.99
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 8.14748
Product name : Tetramethylammonium hydroxide
Purity: (25% solution in water) for synthesis
Packaging: 25KG
Price: ₹89440.01
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 426318
Product name : Tetramethylammonium hydroxide solution
Purity: ACS reagent
Packaging: 250ML
Price: ₹3150.08
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 334901
Product name : Tetramethylammonium hydroxide solution
Purity: 25?wt. % in methanol
Packaging: 100ML
Price: ₹5466.3
Updated: 2022/06/14
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Tetramethylammonium hydroxide Chemical Properties,Usage,Production

Description Tetramethylammonium hydroxide is a solid in the hydrated form or a colorless liquid with a strong ammonia-like odor. It is soluble in water, and corrosive to metals and tissue.
Chemical Properties colourless to yellow liquid
Uses Tetramethylammonium hydroxide is used to produce tetramethyl-ammonium azide. It is used as an anisotropic etchant of silicon, basic solvent in the development of acidic photoresist in photolithography process, as surfactant in the synthesis of ferrofluid and as a polarographic reagent. It finds application in the production of organic silicon, where it is used for computer silicon wafer surface brightener and cleaning agent. It is also involved in the purification of some metallic elements.
Tetramethylammonium hydroxide solution (25 wt.% solution in water) may be used as a base for pH adjustment to obtain hexagonal mesoporous aluminophosphate (TAP).
Uses
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Industry

Application

Role/benefit

Organic silicon

Production of dimethyl silicone oil, organic silicon resin, silicon rubber, etc.

Catalyst/removed easily; no pollution to the products

Chemical analysis

Polarography experiment

Polarographic reagent

Thermochemolysis to study fungal degradation of wood

Analytical reagent

Chemical purification

Removal of metal elements

Ash free alkali/source of base; make the metal elements precipitated

Electron

Production of computer silicon chip

Brightening agent; anisotropic etching agent; cleaning agent; photoresist developer

Printing of circuit board

Cleaning agent

Semiconductor manufacturing

Chemical stripper

Others

Synthesis of ferrofluid

Surfactant/ inhibit nanoparticle aggregation

Synthesis of zeolite

Structure directing agent
General Description Tetramethylammonium hydroxide is a quaternary ammonium salt generally used as an anisotropic etchant for silicon due to its high silicon etching rate.
Reactivity Profile Tetramethylammonium hydroxide acts like a base. Bases are chemically similar to sodium hydroxide (NaOH) or sodium oxide (Na2O). They neutralize acids exothermically to form salts plus water. When soluble in water they give solutions having a pH greater than 7.0. Mixing these materials with water can generate troublesome amounts of heat as the base is dissolved or diluted. Bases react with certain metals (such as aluminum and zinc) to form oxides or hydroxides of the metal and generate gaseous hydrogen. Bases may initiate polymerization reactions in polymerizable organic compounds, especially epoxides). They may generate flammable and/or toxic gases with ammonium salts, nitrides, halogenated organics, various metals, peroxides, and hydroperoxides. Materials of this group often serve as catalysts.
Health Hazard TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
reaction suitability reaction type: Acid-base reactions
reaction type: Redox Reactions
Safety Profile Poison by subcutaneous route. A powerful caustic. A corrosive irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of NOx and NH3.
Purification Methods It is freed from chloride ions by passage through an ion-exchange column (e.g. Amberlite IRA-400, prepared in its OH-form by passing 2M NaOH until the effluent is free from chloride ions, then washed with distilled H2O until neutral). A modification, to obtain carbonate-free hydroxide, uses the method of Davies and Nancollas [Nature 165 237 1950]. [Beilstein 4 IV 145.]
References 1.https://en.wikipedia.org/wiki/Tetramethylammonium_hydroxide#Uses
2.http://sacheminc.com/other-chemicals/tetramethylammonium-hydroxide-tmah/
3.https://www.fs.usda.gov/treesearch/pubs/15506
4.https://www.concordia.ca/content/dam/concordia/services/safety/docs/EHS-DOC-020_TMAHGuidelines.pdf
5.https://www.chemicalbook.com/ChemicalProductProperty_EN_CB2854236.htm