a-Naphthyl red

Name: a-Naphthyl red
Brand: Vaqora Chemicals
SKU: VQ-020442

About a-Naphthyl red

a-Naphthyl red (CAS 131-22-6) is an indicator offered by Vaqora Chemicals. Its molecular formula is C16H13N3 and its molecular weight is 247.29 g/mol. Its systematic (IUPAC) name is 4-phenyldiazenylnaphthalen-1-amine. Common synonyms include 4-Phenylazo-1-naphthylamine and 4-(Phenylazo)-1-naphthylamine.

Store sealed in a dry, well-ventilated location away from incompatible materials. It carries the GHS signal word “Warning” with 2 hazard statements. Review the Safety Data Sheet before use.

It is commonly used for titration end-point detection, pH determination, analytical testing and indicator for titrations. It is used across academic and industrial research and textiles and dyeing.

We offer a-Naphthyl red in 5 g packs with a batch-specific COA, and ship to customers worldwide. A Safety Data Sheet (SDS) and technical specifications are available on request. Larger quantities and custom packaging are available. Request a quote for pricing and lead time.

Typical applications

Titration end-point detection
pH determination
Analytical testing
Indicator for titrations

Industries

Specifications & identifiers

Chemical identifiers
Product name	a-Naphthyl red
Catalogue No.	VQ-020442
CAS Number	131-22-6
IUPAC name	4-phenyldiazenylnaphthalen-1-amine
Molecular formula	C₁₆H₁₃N₃
Molecular weight	247.29 g/mol
Exact mass	247.1109
InChIKey	IICHURGZQPGTRD-UHFFFAOYSA-N
SMILES	C1=CC=C(C=C1)N=NC2=CC=C(C3=CC=CC=C32)N
PubChem CID	8562

Physical properties
Physical form	Other
LogP (XLogP3)	4.3
H-bond donors / acceptors	1 / 3
TPSA	50.7 Å²
Synonyms	4-Phenylazo-1-naphthylamine, 4-(Phenylazo)-1-naphthylamine, alpha-Naphthyl red, 4-Benzeneazo-1-naphthylamine, 1-Naphthalenamine, 4-(2-phenyldiazenyl)-, 1-Naphthalenamine, 4-(phenylazo)-, .alpha.-Naphthyl red, 1-Naphthylamine, 4-(phenylazo)-, Naphthalene, 1-phenylazo-4-amino-, Phenylazo alpha-naphthylamine, Phenylazo-alpha-naphthylamine, 4-Benzene-azo-alpha-naphthylamine

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H315Causes skin irritation
H319Causes serious eye irritation

Precautionary statements: P264, P264 + P265, P280, P302 + P352, P305 + P351 + P338, P321, P332 + P317, P337 + P317, P362 + P364

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of a-Naphthyl red?

The CAS Registry Number of a-Naphthyl red is 131-22-6. It is also known as 4-Phenylazo-1-naphthylamine, 4-(Phenylazo)-1-naphthylamine, alpha-Naphthyl red.

What is the molecular formula and molecular weight of a-Naphthyl red?

a-Naphthyl red has the molecular formula C16H13N3 and a molecular weight of 247.29 g/mol. Its IUPAC name is 4-phenyldiazenylnaphthalen-1-amine.

Which grade and pack sizes of a-Naphthyl red can I order?

We supply a-Naphthyl red, in 5 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with a-Naphthyl red?

Yes. Every lot of a-Naphthyl red is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can a-Naphthyl red be shipped internationally?

Yes. a-Naphthyl red is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.