Methyl red

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Catalog Number
ACM493527
Product Name
Methyl red
Structure
Structure
CAS
493-52-7
Category
Heterocyclic Organic Compound
Description
Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1. Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants. Methyl red is classed by the IARC in group 3 – unclassified as to carcinogenic potential in humans.
Synonyms
2-[4-(dimethylamino)phenylazo]benzoic acid;4′-dimethylaminoazobenzene-2-carboxylic acid;Methyl Red,indicator;2-(4-Dimethylaminophenylazo)benzoic acid;4-Dimethylaminoazobenzene-2′-carboxylic acid
IUPAC Name
2-[4-(dimethylamino)phenyl]diazenylbenzoic acid
Molecular Weight
269.30
Molecular Formula
C15H15N3O2
Canonical SMILES
CN(C)C1=CC=C(C=C1)N=NC2=CC=CC=C2C(=O)O
InChI Key
CEQFOVLGLXCDCX-UHFFFAOYSA-N
Boiling Point
479.5ºC at 760mmHg
Melting Point
178-182ºC
Flash Point
11ºC
Density
0.839 g/mL at 25ºC
Appearance
Red crystalline powder
EC Number
207-776-1
Exact Mass
269.11600
Hazard Codes
Xn
Hazard Statements
Xn:Harmful;
H-Bond Acceptor
5
H-Bond Donor
1
HS Code
29270000
LogP
3.86620
MDL Number
MFCD00002425
PSA
65.26
Refractive Index
1.592
RIDADR
UN 1170
Safety Description
S36/37
Stability
Stable. Incompatible with strong oxidizing agents.
Storage Conditions
-20ºC
Vapor Pressure
2.89E-10mmHg at 25°C
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