Methyl red

Name: Methyl red
Brand: Vaqora Chemicals
SKU: VQ-000624

About Methyl red

Listed under CAS 493-52-7, Methyl red is a biological stain available from Vaqora Chemicals. Formula C15H15N3O2, molecular weight 269.3 g/mol. The IUPAC name is 2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid. It is also known as Acid Red 2 or O-Methyl red.

In its supplied form it is dark red to maroon to violet or purple powder powder or crystals. Reported physical data include a melting point of 179 - 182 °C. Keep the container tightly sealed and store it in a cool, dry area. Good laboratory practice and suitable PPE are recommended during handling.

It is commonly used for histology and cytology staining, microscopy and clinical laboratories. Typical end-use sectors are academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Available in 25 g, 100 g, 500 g and 1 kg packs, Methyl red is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories

Industries

Specifications & identifiers

Chemical identifiers
Product name	Methyl red
Catalogue No.	VQ-000624
CAS Number	493-52-7
IUPAC name	2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid
Molecular formula	C₁₅H₁₅N₃O₂
Molecular weight	269.3 g/mol
Exact mass	269.1164
HSN code	29270090
InChIKey	CEQFOVLGLXCDCX-UHFFFAOYSA-N
SMILES	CN(C)C1=CC=C(C=C1)N=NC2=CC=CC=C2C(=O)O
PubChem CID	10303

Physical properties
Physical form	Crystalline
Appearance	Dark red to maroon to violet or purple powder powder or crystals
Melting point	179 - 182 °C
LogP (XLogP3)	3.3
H-bond donors / acceptors	1 / 5
TPSA	65.3 Å²
Synonyms	Acid Red 2, O-Methyl red, 2-((4-(dimethylamino)phenyl)diazenyl)benzoic acid, 2-{[4-(dimethylamino)phenyl]diazenyl}benzoic acid, C.I. Acid Red 2, 2-Carboxy-4'-(dimethylamino)azobenzene, 4-Dimethylamino-2'-carboxylazobenzene, p-(Dimethylamino)azobenzene-o-carboxylic acid, Cerven methylova, 2-(4-Dimethylaminophenylazo)benzoic acid, Cerven kysela 2, o-((p-(Dimethylamino)phenyl)azo)benzoic acid

Documents

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

Other grades of CAS 493-52-7

ACS

Methyl red ACS reagent, crystalline

CAS: 493-52-7
Formula: C₁₅H₁₅N₃O₂
MW: 269.3 g/mol

VQ-000625

Microscopy

Methyl red solution

CAS: 493-52-7
Formula: C₁₅H₁₅N₃O₂
MW: 269.3 g/mol

VQ-003596

EP/Ph. Eur. / ACS

Methyl red, EP/Ph. Eur., ACS

CAS: 493-52-7
Formula: C₁₅H₁₅N₃O₂
MW: 269.3 g/mol

VQ-047203

Frequently asked questions

What is the CAS number of Methyl red?

The CAS Registry Number of Methyl red is 493-52-7. It is also known as Acid Red 2, O-Methyl red, 2-((4-(dimethylamino)phenyl)diazenyl)benzoic acid.

What is the molecular formula and molecular weight of Methyl red?

Methyl red has the molecular formula C15H15N3O2 and a molecular weight of 269.3 g/mol. Its IUPAC name is 2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid.

Which grade and pack sizes of Methyl red can I order?

We supply Methyl red, in 25 g, 100 g, 500 g, 1 kg, 5 kg, 25 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Methyl red?

Yes. Every lot of Methyl 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 Methyl red be shipped internationally?

Yes. We export Methyl red worldwide by air and sea freight or express courier, on EXW, FOB, CIF, CFR or DAP Incoterms, with full export documentation.