4-Nitroazobenzene
4-硝基偶氮苯
Also known as: Diazene,1-(4-nitrophenyl)-2-phenyl-, (4-Nitrophenyl)phenyldiazene, Azobenzene, 4-nitro-, p-Nitroazobenzene, (E)-1-(4-nitrophenyl)-2-phenyldiazene, 4-nitro-azobenzen, MFCD00007309, EINECS 219-656-6, NSC 16043
4-Nitroazobenzene (CAS 2491-52-3) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C12H9N3O2 and a molecular weight of 227.21900 g/mol. It is also known as Diazene,1-(4-nitrophenyl)-2-phenyl-, (4-Nitrophenyl)phenyldiazene and Azobenzene, 4-nitro-. Key properties include a melting point of 132-134ºC(lit.), a boiling point of 392.9ºC at 760mmHg, a density of 1.23g/cm3 and a flash point of 191.4ºC. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H312 — Harmful in contact with skin and H332 — Harmful if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 2491-52-3
- Jingsj CID
- J-22772-0
- Molecular Formula
- C12H9N3O2
- Chinese Name
- 4-硝基偶氮苯
- Molecular Weight
- 227.21900 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 132-134ºC(lit.) |
|---|---|
| Boiling Point | 392.9ºC at 760mmHg |
| Density | 1.23g/cm3 |
| Flash Point | 191.4ºC |
| Exact Mass | 227.06900 |
| PSA | 70.54000 |
| LogP | 4.53340 |
| Vapor Pressure | 5.02E-06mmHg at 25°C |
| Refractive Index | 1.62 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H312 — Harmful in contact with skin
- H332 — Harmful if inhaled
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
- H351 — Suspected of causing cancer
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 4-Nitroazobenzene?
The CAS number of 4-Nitroazobenzene is 2491-52-3.
What are the molecular formula and molecular weight of 4-Nitroazobenzene?
4-Nitroazobenzene has molecular formula C12H9N3O2 and molecular weight 227.21900 g/mol.
Is 4-Nitroazobenzene hazardous?
4-Nitroazobenzene has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H312 — Harmful in contact with skin; H332 — Harmful if inhaled.
What are the upstream and downstream products of 4-Nitroazobenzene?
For 4-Nitroazobenzene, Upstream Products: 4-Aminoazobenzene, 2,5-Cyclohexadiene-1,4-dione, monoxime, Nitrosobenzene; Downstream Products: 4-Aminoazobenzene.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Nitroazobenzene (CAS 2491-52-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-22772-0 (accessed 2026-10-28).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.