Methyl yellow
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| Methyl yellow | |
|---|---|
| Image:Methyl yellow.png | |
| IUPAC name | p-Dimethylaminoazobenzene |
| Other names | 4-Dimethylaminoazobenzene, N,N-Dimethyl-4-phenylazoaniline, N,N-Dimethyl-4-aminoazobenzene, Butter Yellow, Solvent Yellow 2, C.I. 11020 |
| Identifiers | |
| CAS number | |
| PubChem | |
| EINECS number | |
| RTECS number | BX7350000 |
| SMILES | CN(C)C(C=C2)=CC=C2N=NC1=CC=CC=C1 |
| Properties | |
| Molecular formula | C14H15N3 |
| Molar mass | 225.289 g.mol-1 |
| Appearance | Yellow crystals |
| Melting point |
116 °C (decomp.) |
| Solubility in water | 13.6 mg.l-1 |
| log P | 4.58 |
| Hazards | |
| Main hazards | Toxic (T) |
| NFPA 704 |
|
| R-phrases | R25, R40 |
| S-phrases | S36/37, S45 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator.
| Methyl yellow (pH indicator) | ||
| below pH 2.9 | above pH 4.0 | |
| 2.9 | ↔ | 4.0 |
In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.
Additional indicators are listed in the article on pH indicators.
As "butter yellow" the agent had been used as a food additive before its toxicity was recognized (Opie EL)
References
- NIOSH Pocket Guide to Chemical Hazards 0220
- Eugene L. Opie. The Pathogenesis of Tumors of the Liver Produced by Butter Yellow. The Journal of Experimental Medicine, Vol 80, 231-246, 1944.
See also
Structuraly similar compounds:
External links
- International Chemical Safety Card 1498
- More synonyms
- Mutagenicity testing of some commonly used dyesit:4-dimetilamminoazobenzene
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
