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Cas Database |
| Name |
M-Methyl Red |
EINECS | 999-999-2 |
| CAS No. | 20691-84-3 | Density | 1.17 g/cm3 |
| PSA | 65.26000 | LogP | 3.86620 |
| Solubility | N/A | Melting Point |
207-208 °C |
| Formula | C15H15N3O2 | Boiling Point | 486.189 °C at 760 mmHg |
| Molecular Weight | 269.303 | Flash Point | 247.838 °C |
| Transport Information | N/A | Appearance | N/A |
| Safety | Risk Codes | N/A | |
| Molecular Structure |
|
Hazard Symbols | N/A |
| 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; |
Article Data | 4 |
M-Methyl Red Chemical Properties
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:
M-Methyl Red Uses
M-Methyl Red (CAS NO.20691-84-3) is used as an indicator dye that turns red in acidic solutions.
M-Methyl Red 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. |
M-Methyl Red 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
M-Methyl Red 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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M-Methyl Red 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.
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