Azobenzene
Also known as: Azobenzol, (E)-Diphenyldiazene, 1,2-Diphenyldiazene, Azofume, Benzofume, Diphenyldiazene, trans-Azobenzene, EINECS 203-102-5, MFCD00003022
Azobenzene (CAS 103-33-3) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C12H10N2 and a molecular weight of 182.221 g/mol. Key properties include a melting point of 66 °C, a boiling point of 293.0±9.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 122.9±19.6 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H332 — Harmful if inhaled and H341 — Suspected of causing genetic defects. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 103-33-3
- Jingsj CID
- J-26455-2
- Molecular Formula
- C12H10N2
- Molecular Weight
- 182.221 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 66 °C |
|---|---|
| Boiling Point | 293.0±9.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 122.9±19.6 °C |
| Exact Mass | 182.084396 |
| PSA | 24.72000 |
| LogP | 3.82 |
| Vapor Pressure | 0.0±0.6 mmHg at 25°C |
| Refractive Index | 1.575 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H332 — Harmful if inhaled
- H341 — Suspected of causing genetic defects
- H350 — May cause cancer
- H373 — May cause damage to organs through prolonged exposure
- H410 — Very toxic to aquatic life with long lasting effects
Activity & Biological Data
| Additional Information | [1]. Aemissegger A, et al. Synthesis and application of an azobenzene amino acid as a light-switchable turn element in polypeptides. Nat Protoc. 2007;2(1):161-7. [2]. Renner C, et al. Azobenzene as photoresponsive conformational switch in cyclic peptides. J Pept Res. 2005 Jan;65(1):4-14. [3]. Beharry AA, et al. Azobenzene photoswitches for biomolecules. Chem Soc Rev. 2011 Aug;40(8):4422-37. |
|---|
Customs & Trade Information
| HS Code | 2927000090 |
|---|---|
| Summary | 2927000090 other diazo-, azo- or azoxy-compounds。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Azobenzene?
The CAS number of Azobenzene is 103-33-3.
What are the molecular formula and molecular weight of Azobenzene?
Azobenzene has molecular formula C12H10N2 and molecular weight 182.221 g/mol.
Is Azobenzene hazardous?
Azobenzene has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H332 — Harmful if inhaled; H341 — Suspected of causing genetic defects.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Azobenzene (CAS 103-33-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-26455-2 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.