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| CAS No.: | 20691-84-3 |
|---|---|
| Name: | M-METHYL RED |
| Article Data: | 4 |
| Molecular Structure: | |
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| Formula: | C15H15N3O2 |
| Molecular Weight: | 269.303 |
| Synonyms: | Benzoicacid, 3-[[4-(dimethylamino)phenyl]azo]- (9CI);Benzoic acid,m-[[p-(dimethylamino)phenyl]azo]- (6CI,7CI,8CI);3-[4-(Dimethylamino)phenylazo]benzoic acid;3'-Carboxy-4-dimethylaminoazobenzene;m-Methyl red; |
| EINECS: | 999-999-2 |
| Density: | 1.17 g/cm3 |
| Melting Point: | 207-208 °C |
| Boiling Point: | 486.189 °C at 760 mmHg |
| Flash Point: | 247.838 °C |
| PSA: | 65.26000 |
| LogP: | 3.86620 |
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Chemistry
IUPAC Name: 3-(4-Dimethylaminophenyl)Diazenylbenzoic Acid
Synonyms: M-Methyl Red ; 3-((P-(Dimethylamino)Phenyl)Azo)Benzoicacid ; 3'-Carboxy-4-Dimethylaminoazobenzene ; M-((P-(Dimethylamino)Phenyl)Azo)-Benzoicaci ; 4-Dimethylaminoazobenzene-3'-Carboxylic Acid ; P-Dimethylaminoazobenzene-M-Carboxylic Acid ; 3-Methylred ; N-Methylred
Classification Code: Mutation data; Tumor data
Molecular Formula: C15H15N3O2
Molecular Weight: 269.3
Index of Refraction: 1.592
Molar Refractivity: 77.97 cm3
Molar Volume: 230.1 cm3
Surface Tension: 44.3 dyne/cm
Density: 1.17 g/cm3
Flash Point: 247.8 °C
Boiling Point: 486.2 °C at 760 mmHg
Vapour Pressure: 2.89E-10 mmHg at 25 °C
Enthalpy of Vaporization: 79.19 kJ/mol
Following is the molecular structure of M-Methyl Red (CAS NO.20691-84-3) is:
Uses
M-Methyl Red (CAS NO.20691-84-3) is used as an indicator dye that turns red in acidic solutions.
Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| rat | LD50 | oral | 3757mg/kg (3757mg/kg) | Neoplasma. Vol. 27, Pg. 237, 1980. |
Safety Profile
Moderately toxic by ingestion. Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.
RTECS: DG8959500
Analytical Methods
As an azo dye, M-Methyl Red (CAS NO.20691-84-3) may be prepared by diazotization of anthranilic acid, followed by reaction with dimethylaniline:
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Specification
M-Methyl Red (CAS NO.20691-84-3) is an azo dye, and is a dark red crystalline powder.It 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.