8.20118 EMD Millipore


trans-Azobenzene for synthesis. CAS 103-33-3, EC Number 203-102-5, chemical formula C₆H₅N=NC₆H₅., for synthesis

Synonym: Diazobenzene, Diphenyl diimide, Diphenyldiazene

  • CAS Number 103-33-3

  • Linear Formula C₁₂H₁₀N₂

  • Molecular Weight 182.23 g/mol

  •  EC Number 203-102-5



Related Categories Biochemicals and Reagents More...
packaging   25 g in Glass bottle (8201180025)
bp   291 - 294 °C (1013 hPa)
vapor pressure   0.00048 hPa (25 °C)
solubility   6.4 mg/l
density   1.203 g/cm3
flash point   100 °C
mp   66 - 69 °C
LD 50 oral   LD50 Rat 1000 mg/kg
shipped in   ambient
storage temp.   Store below +30°C.
specifications   Assay (GC, area%): ≥ 96.0 % (a/a)
  Melting range (lower value): ≥ 65 °C
  Melting range (upper value): ≤ 68 °C
  Identity (IR): passes test

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Safety Information

HS Code 
2927 00 00
Hazard Statement(s) 
H350: May cause cancer.
H302 + H332: Harmful if swallowed or if inhaled
H341: Suspected of causing genetic defects.
H373: May cause damage to organs through prolonged or repeated exposure.
H410: Very toxic to aquatic life with long lasting effects.
Precautionary Statement(s) 
P201: Obtain special instructions before use.
P273: Avoid release to the environment.
P314: Get medical advice/ attention if you feel unwell.
Storage class 
6.1C Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
WGK 3 highly water endangering
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).
Hazard Pictogram(s) 
GHS07  GHS07
Hazard Pictogram(s) 
GHS08  GHS08
Hazard Pictogram(s) 
GHS09  GHS09
Hazard Symbols 
Dangerous for the environment  Dangerous for the environment
Hazard Symbols 
Toxic  Toxic
Declaration (railroad and road) ADR, RID 
UN 3077 , 9, III
Declaration (transport by air) IATA-DGR 
UN 3077 , 9, III
Declaration (transport by sea) IMDG-Code 
UN 3077 , 9, III, Marine Pollutant: P
Categories of danger 
carcinogenic, harmful, mutagenic, dangerous for the environment
R Phrase 
R 45-20/22-48/22-68-50/53
May cause cancer.Also harmful by inhalation and if swallowed.Also harmful: danger of serious damage to health by prolonged exposure if swallowed.Possible risk of irreversible effects.Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
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.
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