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Methyl yellow

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Methyl yellow
Names
IUPAC name
p-Dimethylaminoazobenzene
Other names
4-Dimethylaminoazobenzene, DAB, N,N-Dimethyl-4-phenylazoaniline, N,N-Dimethyl-4-aminoazobenzene, Butter Yellow, Solvent Yellow 2, C.I. 11020
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.000.414 Edit this at Wikidata
EC Number
  • 200-455-7
RTECS number
  • BX7350000
UNII
  • InChI=1S/C14H15N3/c1-17(2)14-10-8-13(9-11-14)16-15-12-6-4-3-5-7-12/h3-11H,1-2H3/b16-15+ checkY
    Key: JCYPECIVGRXBMO-FOCLMDBBSA-N checkY
  • InChI=1/C14H15N3/c1-17(2)14-10-8-13(9-11-14)16-15-12-6-4-3-5-7-12/h3-11H,1-2H3/b16-15+
    Key: JCYPECIVGRXBMO-FOCLMDBBBF
  • N(=N/c1ccccc1)\c2ccc(N(C)C)cc2
Properties
C14H15N3
Molar mass 225.295 g·mol−1
Appearance Yellow crystals
Melting point 111–116 °C (232–241 °F; 384–389 K)
decomposes[1]
13.6 mg/l
log P 4.58
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Carcinogen[2]
GHS labelling:
GHS06: ToxicGHS08: Health hazard[1]
Danger
H301, H351[1]
P281, P301+P310[1]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
1
0
NIOSH (US health exposure limits):
PEL (Permissible)
 OSHA-regulated carcinogen[2]
REL (Recommended)
 Ca[2]
IDLH (Immediate danger)
 Ca [N.D.][2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

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.

Safety

It is a possible carcinogen.[3] As "butter yellow", the agent had been used as a food additive before its toxicity was recognized.[4] The result from consuming such chemicals is tumors on the liver.

See also

Structurally similar compounds:

References

  1. ^ a b c d Dimethyl yellow
  2. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0220". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ NIOSH Pocket Guide to Chemical Hazards. "#0220". National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Opie, E. L. (1944). "The Pathogenesis of Tumors of the Liver Produced by Butter Yellow" (pdf). The Journal of Experimental Medicine. 80 (3): 231–246. doi:10.1084/jem.80.3.231. PMC 2135460. PMID 19871411.
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