Hexadecyltrimethylammonium Chloride TCI H0082

Chemical Identity

Other names: CTAC · Cetyltrimethylammonium Chloride · HTAC · CTAC
CAS No.: 112-02-7
PubChem: CID 8154·SID 87570531
Formula: C19H42ClN
Molecular weight: 320.00 g/mol
Purity: >95.0%(T)
Reference databases: ChEBI·ChemSpider·ECHA·Wikipedia

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: hexadecyl(trimethyl)azanium chloride
SMILES: CCCCCCCCCCCCCCCC[N+](C)(C)C.[Cl-]
InChIKey: WOWHHFRSBJGXCM-UHFFFAOYSA-M
MDL: MDL00011773

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TCI H0082 Hexadecyltrimethylammonium Chloride, commonly abbreviated as CTAC, is a quaternary ammonium salt built on the same cationic framework as CTAB but paired with a chloride anion instead of bromide. This apparently minor difference in counter-ion turns out to matter a great deal in day-to-day laboratory practice, because the choice of anion influences solubility, micellar behaviour, and the tendency of the surfactant to adsorb onto surfaces. As a phase transfer catalyst, CTAC carries reactive anions from the aqueous phase into the organic phase, allowing two-phase reactions to proceed at a workable rate without the need to redesign the entire solvent system.

The properties that make CTAC a preferred choice follow directly from its chloride counter-ion. Because chloride is smaller and more strongly hydrated than bromide, CTAC is generally more readily soluble in water than its bromide analogue, which is advantageous whenever a researcher needs to prepare highly concentrated surfactant solutions. Chloride is also regarded as the more weakly coordinating anion, so in nanomaterial synthesis it interferes less with the surfaces of growing particles. Meanwhile, the permanently charged hexadecyltrimethylammonium cation retains strong adsorption onto negatively charged surfaces and forms well-ordered micelles — two characteristics that are the principal reason this class of compound is chosen in the first place.

In Indonesian laboratories, CTAC is typically used wherever a cationic surfactant or phase transfer catalyst is required in aqueous-organic systems: synthetic chemistry groups running two-phase reactions, materials and nanomaterial laboratories preparing templated or surface-modified particles, and analytical or teaching laboratories that need a well-characterised quaternary ammonium salt. Its high water solubility makes it convenient for stock solution preparation under ordinary bench conditions, and the TCI grade provides consistency between batches for work that must be reproduced.

TCI brochures (PDF)

Quaternary Ammonium Salts 2025-11-10 · p. 4
Colloidal Quantum Dot (QD) Research Reagents 2026-05-21 · p. 9
Polymer Additives 2026-04-16 · p. 11

Related TCI products

Phase transfer catalysis in two-phase reactions — CTAC transports reactive anions from the aqueous layer into the organic layer, so reactions that would otherwise stall proceed at an acceptable rate without changing the solvent system.
Nanomaterial and nanoparticle synthesis — the weakly coordinating chloride anion interferes less with the surfaces of growing particles, giving researchers cleaner control over particle growth than a more strongly binding counter-ion allows.
Preparation of concentrated cationic surfactant solutions — because the chloride salt is more water soluble than the bromide analogue, high-concentration stock solutions can be made up without solubility problems at the bench.
Surface modification of negatively charged substrates — the permanently charged hexadecyltrimethylammonium cation adsorbs strongly onto negatively charged surfaces, making CTAC useful for altering the charge and wettability of such materials.
Micelle formation and micellar systems — the compound forms well-ordered micelles in aqueous media, which supports studies of aggregation behaviour and reactions or formulations that depend on a structured micellar environment.

Brand	TCI (Tokyo Chemical Industry)
CAS number	112-02-7
Molecular formula	—
Purity	—
Category	Chemistry > Synthetic Reagents > Phase Transfer Catalysts
Pack sizes	available in standard TCI research and laboratory pack sizes — please confirm the size required when ordering
Physical form	—
Storage	keep in a tightly closed container in a cool, dry place, protected from moisture

Catalogue number: H0082
Chemical class: Quaternary ammonium salt; cationic surfactant and phase transfer catalyst

Store TCI H0082 in its original tightly closed container in a cool, dry, well-ventilated place, away from moisture, since quaternary ammonium salts of this type readily take up water from humid air and may cake or become difficult to weigh. Amber glass or the supplier's original packaging is suitable; transfer aliquots with clean, dry spatulas to avoid contaminating the bulk material. Handle the solid in a fume hood or a well-ventilated area to limit dust formation, and wear safety glasses, gloves, and a laboratory coat. Avoid contact with skin and eyes and avoid inhaling the powder. Prepare aqueous stock solutions in clearly labelled vessels, keep the material away from incompatible substances, and dispose of residues and rinsings according to the applicable institutional chemical waste procedures. Always consult the manufacturer's safety data sheet before first use.

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