β-Naphthol violet

Name: β-Naphthol violet
Brand: Vaqora Chemicals
SKU: VQ-000742

About β-Naphthol violet

Listed under CAS 7143-21-7, β-Naphthol violet is a biological stain available from Vaqora Chemicals in AR grade. With the molecular formula C16H9N3Na2O9S2, it has a molar mass of 497.4 g/mol. The IUPAC name is disodium, 3-hydroxy-4-[(4-nitrophenyl)diazenyl]naphthalene-2,7-disulfonate. Alternative names: beta-NAPHTHOL VIOLET and |A-Naphthol Violet.

In its supplied form it is a brownish to red powder. Reported physical data include a melting point of 122 °C. Solubility: soluble in water. Store in a tightly closed container in a cool, dry and well-ventilated place. It carries the GHS signal word “Warning” with 3 hazard statements. Review the Safety Data Sheet before use.

Typical applications include histology and cytology staining, microscopy and clinical laboratories. It is used across academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Vaqora Chemicals supplies β-Naphthol violet in 25 g, 100 g and 1 kg packs, each shipped with a Certificate of Analysis (COA), and exports worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	β-Naphthol violet
Catalogue No.	VQ-000742
CAS Number	7143-21-7
IUPAC name	disodium;3-hydroxy-4-[(4-nitrophenyl)diazenyl]naphthalene-2,7-disulfonate
Molecular formula	C₁₆H₉N₃Na₂O₉S₂
Molecular weight	497.4 g/mol
Exact mass	496.9576
Grade	AR
HSN code	32049000
InChIKey	YTTDMCWAOBZSJR-UHFFFAOYSA-L
SMILES	C1=CC(=CC=C1N=NC2=C3C=CC(=CC3=CC(=C2O)S(=O)(=O)[O-])S(=O)(=O)[O-])[N+](=O)[O-].[Na+].[Na+]
PubChem CID	3084003

Physical properties
Physical form	Powder
Appearance	Brownish to red powder
Melting point	122 °C
Solubility	Soluble in water
H-bond donors / acceptors	1 / 11
TPSA	222 Å²
Synonyms	Disodium 3-hydroxy-4-((4-nitrophenyl)azo)naphthalene-2,7-disulphonate, Disodium 3-hydroxy-4-[(4-nitrophenyl)azo]naphthalene-2,7-disulphonate, beta-NAPHTHOL VIOLET, Disodium 3-hydroxy-4-(4-nitrophenyl)azonaphthalene-2,7-disulphonate, Sodium 3-hydroxy-4-((4-nitrophenyl)diazenyl)naphthalene-2,7-disulfonate, A-Naphthol Violet, 2-Naphthol violet, 1-(4-Nitrophenylazo)-2-naphthol-3,6-disulfonic Acid Disodium Salt, Disodium 3-hydroxy-4-[(4-nitrophenyl)diazenyl]naphthalene-2,7-disulfonate

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

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 β-Naphthol violet?

The CAS Registry Number of β-Naphthol violet is 7143-21-7. It is also known as Disodium 3-hydroxy-4-((4-nitrophenyl)azo)naphthalene-2,7-disulphonate, Disodium 3-hydroxy-4-[(4-nitrophenyl)azo]naphthalene-2,7-disulphonate, beta-NAPHTHOL VIOLET.

What is the molecular formula and molecular weight of β-Naphthol violet?

β-Naphthol violet has the molecular formula C16H9N3Na2O9S2 and a molecular weight of 497.4 g/mol.

Which grade and pack sizes of β-Naphthol violet can I order?

We supply β-Naphthol violet in AR grade, in 25 g, 100 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with β-Naphthol violet?

Yes. Every lot of β-Naphthol violet 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 β-Naphthol violet be shipped internationally?

Yes. β-Naphthol violet 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.