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LC703 trans-Azobenzene

for synthesis


Order number Packaging Quantity Price €
AC27703 Glass bottle 25 g 22.50
AC27703 Glass bottle 100 g 71.55


Product information
Synonyms Diazobenzene, Diphenyl diimide, Diphenyldiazene
Hill Formula C12H10N2
Chemical formula C6H5N=NC6H5
HS Code 2927 00 00
EC number 203-102-5
Molar mass 182.23 g/mol
EC index number 611-001-00-6
CAS number 103-33-3


Chemical and physical data

Solubility 6.4 mg/l (25 °C)
Melting point 66 – 69 °C
Molar mass 182.23 g/mol
Density 1.203 g/cm3
Boiling point 291 – 294 °C
Vapor pressure 0.00048 hPa (25 °C)
Flash point 476 °C


Safety information
R Phrase R 45-20/22-48/22-50/53-68
May cause cancer.Also harmful by inhalation and if swallowed.Also harmful: danger of serious damage to health by prolonged exposure if swallowed.Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.Possible risk of irreversible effects.
S Phrase S 53-45-60-61
Avoid exposure – obtain special instructions before use.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).This material and its container must be disposed of as hazardous waste.Avoid release to the environment. Refer to special instructions/ Safety data sheets.
Categories of danger carcinogenic, harmful, dangerous for the environment, mutagenic
Hazard Symbol Toxic
Dangerous for the environment
Storage class 6.1A Combustible substances, toxic
WGK WGK 3 highly water endangering
Disposal 9
Carcinogenic compounds and flammable compounds labelled “Highly toxic” or “Toxic”: container F. Alkyl sulfates are carcinogenic; Take particular care to avoid inhalation and skin contact. To neutralize alkyl sulfates, add dropwise (from a dropping funnel) to concentrated ice-cool Ammonia solution (Cat.No. 105426) with vigorous stirring. Before placing in container D, check the pH with pH Universal indicator strips (Cat.No. 109535).


Transport information
Declaration (transport by sea) IMDG-Code UN 3077 ENVIRONMENTALLY HAZARDOUS SUBSTANCE, SOLID, N.O.S.(TRANS-AZOBENZENE), 9, III, Marine Pollutant: P


Toxicological data
LD 50 oral LD50 rat 1000 mg/kg


Assay (GC, area%) ≥ 96 %
Melting range
– lower value
≥ 65 °C
– upper value ≤ 68 °C
Identity (IR) passes test


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