Substance profile
4-Aminoazobenzene
4-Aminoazobenzene is brownish-yellow needles with bluish cast.
01 · Identification
What 4-Aminoazobenzene is
4-Aminoazobenzene is brownish-yellow needles with bluish cast. Its molecular formula is C12H11N3 and its molecular weight is 197.24 g/mol. It boils at 360 °C, melts at 128 °C.
Under the GHS it carries the signal word Danger. It is classed as carcinogens.
Other names for 4-Aminoazobenzene
- 4-phenylazoaniline
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H350 | May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P201, P273, P280, P308, P313, P391, P501
03 · Physical and chemical properties
4-Aminoazobenzene properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 360 °C (680 °F) | at 760 mmHg | DOE PAC |
| 360 °C (680 °F) | above this value | HSDB | |
| 360 °C (680 °F) | above this value, at 760 mmHg | CAMEO | |
| Melting point | 128 °C (262.4 °F) | HSDB | |
| 127.78 °C (262 °F) | CAMEO | ||
| 126 °C (258.8 °F) | DOE PAC | ||
| Density | 1.05 g/cm³ | CAMEO | |
| Solubility | Freely sol in alcohol, benzene, chloroform, ether | HSDB | |
| In water, 32 mg/L at 25 °C | at 25 °C | HSDB | |
| less than 1 mg/mL at 66 °F (NTP, 1992) | at 18.89 °C | CAMEO | |
| Vapor pressure | 0.0000014 mmHg | at 25 °C | HSDB |
| 0.0000014 mmHg | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling 4-Aminoazobenzene
Storage conditions
Prior to working with this chemical you should be trained on its proper handling and storage. Store in tightly closed containers in a cool, well ventilated area away from strong oxidizers.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
4-AMINOAZOBENZENE can detonate, particularly if sensitized by the presence of metal salts or strong acids. May form toxic gases with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. May form flammable gases with alkali metals. May react explosively with strong oxidizing agents, metal salts, peroxides, and sulfides. Emits toxic fumes of oxides of nitrogen when heated to decomposition (over 350 °C) [Sax, 2nd ed., 1965, p. 417].
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check 4-Aminoazobenzene in the storage compatibility matrix →