CAS 75-59-2 TETRAMETHYLAMMONIUM HYDROXIDE, SOLUTION1.0 Mol/L in WATER, REAGENT (ACS)

Synonyms

Tetramethylammonium hydroxide solution, ~25% in H₂O; tetra methyl ammonium hydroxide; 75-59-2; Tetrametiloamonio hydroxido; Tetramethylammonium hydroxide solution, 25 wt. % in methanol; Tetrametanoamonio hydroxido; A838458; DB-050413; tetramethylammoniumhydroxide; AC1Q29QX;

IUPAC Name

tetramethylazanium;hydroxide;

Molecular Weight

91.154g/mol

Molecular Formula

C4H13NO;

Canonical SMILES

C[N+](C)(C)C.[OH-];

InChI

InChI=1S/C4H12N.H₂O/c1-5(2,3)4;/h1-4H3;1H2/q+1;/p-1;

InChI Key

WGTYBPLFGIVFAS-UHFFFAOYSA-M;

Melting Point

63 deg C;

Density

Specific gravity of solution approximately 1.00 at 24 deg C/4 deg C;

Solubility

In water, 1.0X10+6 mg/L at 25 deg C /miscible/ (est);

Storage

2-8°C

Color Form

The free base is known only in solution or as a solid pentahydrate, forming colorless, deliquescent needles;Liquid;

Complexity

19.1

Corrosivity

Corrosive;

Covalently-Bonded Unit Count

Decomposition

When heated to decomposition it emits toxic fumes of /nitrogen oxides and ammonia/.;

EC Number

200-882-9

Exact Mass

91.1g/mol

H-Bond Acceptor

H-Bond Donor

Heavy Atom Count

Monoisotopic Mass

91.1g/mol

Odor

Strong ammonia-like;

Other Experimental

Decomposes to trimethylamine and methanol upon distillation;Readily absorbs CO2 from the air;When heated to decomposition it emits toxic fumes of NOx and NH₃.;Concn: 25 wt% in water. VP: 17.5 mm Hg at 20 deg C; Index of refraction: 1/3806 at 20 deg C/D; density: 1.106 g/mL at 25 deg C /Tetramethylammonium hydroxide solution/;Henry's Law constant = 4.35X10-16 atm-cu m/mol at 25 deg C (est);Hydroxyl radical reaction rate constant = 5.06X10-12 cu cm/molec-sec at 25 deg C (est);

Stability

Stable under recommended storage conditions. /Tetramethylammonium hydroxide pentahydrate/;

Topological Polar Surface Area

1A^2

UNII

5GKP7317Q2

UN Number

1835

Vapor Pressure

1.16X10-6 mm Hg at 25 deg C (est);

Application

Tetramethylammonium hydroxide solution, a colorless to yellow liquid with a strong ammonia-like odor, is predominantly used in various industrial applications due to its high solubility in water. This versatile compound serves as a powerful anisotropic etchant for silicon, finding significant roles in semiconductor manufacturing for etching silicon chips, as well as in the development of photoresists during photolithography processes. In the realm of organic silicon, it catalyzes the production of dimethyl silicone oil and related products, while ensuring minimal pollution to the end products. As a base, it participates in chemical purification by aiding the precipitation of metal elements without leaving ash, and it functions as a brightening and cleaning agent for computer silicon wafers. Additionally, tetramethylammonium hydroxide is employed in chemical analysis as a polarographic reagent, in the synthesis of ferrofluid as a surfactant to prevent nanoparticle aggregation, and as a structure-directing agent during the synthesis of zeolites. Its reactivity with acids to form salts and water allows for applications in pH adjustment, such as obtaining hexagonal mesoporous aluminophosphate, while its role in thermochemolysis facilitates studies on fungal degradation of wood. Furthermore, in the electronics industry, it acts as a chemical stripper during circuit board printing and semiconductor fabrication.

December 20, 2024

Reliable Reagent for Analytical Chemistry

In our lab, the 1.0 M TETRAMETHYLAMMONIUM HYDROXIDE solution from Alfa Chemistry proved invaluable for polarography experiments. Its role as a polarographic reagent highlighted its precision and consistency, making it indispensable for our research.