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Aromatic building blocks

Azobenzene

Also known as Diphenyldiazene, 1,2-Diphenyldiazene, (E)-1,2-Diphenyldiazene

CAS 103-33-3Formula C12H10N2Molar mass 182.23 g/molEC 203-102-5
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Azobenzene chemical structure, C12H10N2, CAS 103-33-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
103-33-3
Formula
C12H10N2
Molar mass
182.23 g/mol
EC number
203-102-5
HS code
292700
Category
Aromatic building blocks

What is Azobenzene?

Plain description, key identifiers and synonyms

Azobenzene is a molecule whose structure comprises two phenyl rings linked by a N=N double bond, the parent compound of the azobenzene class of compounds.

Azobenzene is a two phenyl rings linked by a N=N double bond.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
diphenyldiazene
CAS number
103-33-3 CAS number cross-checkedOther or deprecated CAS: 1080-16-6, 17082-12-1
EC number
203-102-5
Molecular formula
C12H10N2
UNII
F0U1H6UG5C
MDL number
MFCD00003022
InChIKey
DMLAVOWQYNRWNQ-UHFFFAOYSA-N
InChI
InChI=1S/C12H10N2/c1-3-7-11(8-4-1)13-14-12-9-5-2-6-10-12/h1-10H
SMILES (canonical and isomeric)
C1=CC=C(C=C1)N=NC2=CC=CC=C2

Synonyms

  • Diphenyldiazene
  • 1,2-Diphenyldiazene
  • (E)-1,2-Diphenyldiazene
  • Azobenzol
  • Diazene, diphenyl-
  • Diphenyldiimide
  • Azofume
  • Azobenzide
  • Azobisbenzene
  • (E)-Diphenyldiazene
  • Diazobenzene
  • Benzofume
  • Benzeneazobenzene
  • Azodibenzeneazofume
  • (Z)-Azobenzene
  • Azobenzeen
  • Azodibenzene
  • cis-Azobenzene
  • Benzene, azobis-
  • Diazene, 1,2-diphenyl-
  • trans-Azobenzene
  • (e)-azobenzene
  • Benzene, azodi
  • USAF EK-704
  • (Z)-diphenyldiazene
Show all 36 synonyms
  • ENT 14,611
  • Benzene, azodi-
  • (E)-azobenzol
  • (E)-azodibenzene
  • (E)-azobisbenzene
  • Diazene, diphenyl-, (E)-
  • Phenylbutazone EP Impurity D
  • diphenyl diimide
  • Diazene, diphenyl-, (Z)-
  • Azobenzene, (E)-
  • phenylazobenzene

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
182.23 g/molcalc.
Exact mass
182.0844 Dacalc.
LogP (octanol/water)
4.1calc.
Topological polar surface area
24.72 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
2calc.
Heavy atoms
14calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccc(N=Nc2ccccc2)cc1

c1ccc(N=Nc2ccccc2)cc1

2 rings, 14 atoms. This chemical is the scaffold itself.

3,419 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Azobenzene suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 27 suppliers
27 of 27 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

27 suppliers in 8 countries

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Azobenzene price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Use classes: Pharmaceuticals.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Azobenzene, Ref no: 727, Annex ref: II/727

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Azobenzene is traded under.

HS 2927.00Indicative HS code

Diazo-, azo- or azoxy compounds

World exports in 2024
$571M
+6.1% vs 2023, imports $525M
2019 to 2024
Top exporters
  1. China47.0%
  2. Indonesia13.1%
  3. Japan9.3%
Top importers
  1. United States10.2%
  2. India * partner reported9.1%
  3. South Korea9.1%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Azobenzene is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Azobenzene, based on the data on this page

What is Azobenzene?

Azobenzene is a molecule whose structure comprises two phenyl rings linked by a N=N double bond, the parent compound of the azobenzene class of compounds.

What is the CAS number of Azobenzene?

The CAS registry number of Azobenzene is 103-33-3. Other or deprecated CAS numbers: 1080-16-6, 17082-12-1.

What is the molecular formula and weight of Azobenzene?

The molecular formula of Azobenzene is C12H10N2 and its molar mass is 182.23 g/mol.

What is Azobenzene used for?

Use classes: Pharmaceuticals.

Is Azobenzene hazardous?

No GHS hazard classification for Azobenzene is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Azobenzene?

Azobenzene is usually classified under HS code 292700 (Diazo-, azo- or azoxy-compounds). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Azobenzene?

CompoundList lists 27 suppliers of Azobenzene in China, United States, Hong Kong, France and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Azobenzene?

Suppliers quote Azobenzene on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Azobenzene

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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