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493-52-7

Name Methyl Red
CAS 493-52-7
EINECS(EC#) 207-776-1
Molecular Formula C15H15N3O2
MDL Number MFCD00002425
Molecular Weight 269.3
MOL File 493-52-7.mol

Chemical Properties

Appearance dark red crystalline powder
Melting point  178-182°C
Boiling point  412.44°C (rough estimate)
bulk density 300-500kg/m3
density  0.839 g/mL at 25 °C
vapor density  9.3 (vs air)
refractive index  1.5930 (estimate)
Fp  11 °C
storage temp.  −20°C
solubility  ethanol: soluble1mg/mL
Colour Index  13020
form  Solid
pka 4.95(at 25℃)
color  Reddish-violet
Odor Odorless
PH Range 4.4(red)-6.3(yellow)
Stability: Stable. Incompatible with strong oxidizing agents.
Water Solubility  Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
ε(extinction coefficient) ≥10000 at 282-288nm in methanol
≥20000 at 509-519nm in methanol
≥7000 at 329-335nm in methanol
λmax 410nm, 530nm, 427nm, 519nm
Merck  14,6119
BRN  750102
Major Application Waveguides, LED sensors, photoresists, liquid crystals, sol-gel matrix, optical sensors, paints, toys, detection of thiols, food freshness sensors, dental product, saliva sampling method, detecting lactic acid, carbohydrates
InChIKey CEQFOVLGLXCDCX-MSUUIHNZSA-N
CAS DataBase Reference 493-52-7
IARC 3 (Vol. 8, Sup 7) 1987
NIST Chemistry Reference Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)
EPA Substance Registry System Benzoic acid, 2-[[4-(dimethylamino)phenyl] azo]-(493-52-7)

Safety Data

Hazard Codes  Xn,T,F,Xi,C,N
Risk Statements 
Safety Statements 
RIDADR  UN 1170 3/PG 2
WGK Germany  1
RTECS  DG8960000
TSCA  Yes
HazardClass  3
PackingGroup  II
HS Code  29270000
Safety Profile
Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.
Hazardous Substances Data 493-52-7(Hazardous Substances Data)

Hazard Information

Material Safety Data Sheet(MSDS)

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