Azobenzene

  • 1,2-Diphenyldiazene
  • Diphenyldiimide
  • Azobenzide
  • Azobenzol
  • Phenylazobenzene
  • Benzeneazobenzene
Formula
C12H10N2
Structure
Description
Yellow to orange-red crystalline solid.
Uses
intermediate for production of benzidine & its salts, intermediate in manufacture of insecticides & pyrazolone derivatives.

Registry Numbers and Inventories.
CAS
103-33-3
EC (EINECS/ELINCS)
203-102-5
EC Index Number
611-001-00-6
EC Class
Carcinogenic Category 2; Mutagenic Category 3; Harmful; Dangerous for the Environment
R 45 E20/22 E48/22 50/53 68
S 53 45 60 61
RTECS
CN1400000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen
UN (DOT)
3077
Merck
12,948
Beilstein/Gmelin
742609
Beilstein Reference
1-16-00-00218
EPA OPP
7401
Swiss Giftliste 1
G-1201
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C12H10N2
Formula mass
182.23
Melting point, °C
66 - 69
Boiling point, °C
293
Vapor pressure, mmHg
0.003 (25 C)
Saturation Concentration
0.47 ppm (4.7 x 10(-5)%) at 25 C
Density
1.203 g/cm3 (20 C)
Solubility in water
Insoluble
Partition coefficient, pKow
3.82
Heat of vaporization
63.80 kJ/mol
Heat of combustion
-6514 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Reduce airborne dust and prevent scattering by moistening with water. Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, nitrogen.

Fire.
Flash Point,°C
123
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
This material is probably combustible.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Carcinogin
CP65
Poison_Class
2
Exposure effects
May cause liver and kidney damage. May cause bone marrow abnormalities with damage to blood forming tissues. May cause cancer according to animal studies. May cause reproductive and fetal effects.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May cause central nervous system depression, characterized by excitement, followed by headache, dizziness, drowsiness, and nausea. Advanced stages may cause collapse, unconsciousness, coma and possible death due to respiratory failure. May be harmful if swallowed.
   Inhalation
Causes respiratory tract irritation. May cause effects similar to those described for ingestion.
   Skin
May cause skin irritation. Causes skin irritation.
   Eyes
May cause eye irritation. Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
3077
Response guide
HS Code
2927 00 00