Hexadecyltrimethylammonium Hydroxide (10% in Water) TCI H0974

Chemical Identity

CAS No.: 505-86-2
PubChem: CID 68166·SID 87571330
Formula: C19H43NO
Molecular weight: 301.6 g/mol
Reference databases: ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: hexadecyl(trimethyl)azanium hydroxide
SMILES: CCCCCCCCCCCCCCCC[N+](C)(C)C.[OH-]
InChIKey: WJLUBOLDZCQZEV-UHFFFAOYSA-M

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Hexadecyltrimethylammonium Hydroxide (10% in Water) is a strong quaternary ammonium base that also functions as a cationic surfactant. Its molecule combines a long, hydrophobic hexadecyl hydrocarbon tail with a positively charged trimethylammonium head group, paired with a hydroxide counter-anion. This combination allows the product to act simultaneously as a base and as a structure-directing agent. In the laboratory, the solution is widely used in the synthesis of porous materials, as a phase-transfer catalyst, and as a basic reagent in reactions and titrations carried out in non-aqueous media.

The main advantage of this product lies in a dual character that few other reagents possess. As a base, its hydroxide ion is strong yet entirely free of alkali metal cations, which makes it especially valuable in systems that must not be contaminated with sodium or potassium, such as zeolite and mesoporous silica synthesis. As a cationic surfactant, the hexadecyl portion forms micelles that act as a soft template for the formation of ordered pores. The ten percent aqueous solution form allows accurate volumetric dispensing and avoids the difficulty of weighing a hygroscopic solid.

In Indonesian laboratories, this reagent is typically found in materials chemistry and catalysis groups at universities and research institutes, as well as in industrial research units working on adsorbents and porous supports. It is generally handled at the bench in fume-hood conditions during hydrothermal preparations, in analytical laboratories performing non-aqueous titrations, and in synthetic chemistry laboratories that require an organic-soluble base for phase-transfer work.

Related TCI products

Mesoporous silica synthesis: the hexadecyl tail forms micellar templates that direct ordered pore architecture while the hydroxide simultaneously supplies the alkaline conditions required for silicate condensation.
Zeolite preparation: supplies a strong hydroxide source without introducing sodium or potassium ions, keeping the framework free of alkali metal contamination that would otherwise alter the product.
Phase-transfer catalysis: the cationic head paired with a long hydrophobic chain carries anionic reagents across phase boundaries, allowing reactions between species in otherwise immiscible media.
Non-aqueous titration: serves as a strong, metal-free basic titrant for determinations conducted in solvent systems where conventional alkali hydroxide solutions are unsuitable.
General basic reagent work: the accurately dispensable ten percent aqueous solution provides a convenient strong base for reactions requiring alkaline conditions without the handling burden of a hygroscopic solid.

Brand	TCI
CAS number	505-86-2
Molecular formula	—
Purity	—
Category	Chemistry > Synthetic Reagents > Acids, Bases [Synthetic Reagents]
Pack sizes	—
Physical form	aqueous solution, 10% in water
Storage	store in a tightly closed container under the conditions recommended by the manufacturer

Catalogue code: H0974

Store the solution in its original tightly closed container, kept upright in a cool, well-ventilated area away from acids and other incompatible materials. Containers should be chemically resistant and sealed to prevent absorption of atmospheric carbon dioxide, which gradually reduces the strength of the hydroxide. Handle the material in a fume hood using safety goggles, chemical-resistant gloves, and a laboratory coat, since strong bases are corrosive to skin and eyes. Dispense volumetrically with clean glassware or plastic pipettes, avoid generating aerosols during transfer, and wipe up any spills promptly with adequate ventilation. Always consult the manufacturer's safety data sheet before use.

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