AZOBENZENE

Molecular Formula: C₁₂H₁₀N₂
Molar mass: 182.2212 g/mol
EINECS: 245-349-1
Density: 1.02 g/cm³
Flash Point: 122.9 °C
Index of Refraction: 1.574
Boiling Point: 293 °C at 760 mmHg
Vapour Pressure: 0.0031 mmHg at 25°C
Melting point: 66 °C
Storage temp: 2-8°C
Appearance: Orange-red crystals or dark brown chunky solid
Product categories: Pharmaceutical Intermediates;Photochromic Compounds;Nitrogen Compounds;Organic Building Blocks;Functional Materials;Acaricides;Alpha sort;Pesticides & Metabolites;Stains and Dyes
Structure of Azobenzene (103-33-3):
                
XLogP3-AA: 3.8
H-Bond Donor: 0
H-Bond Acceptor: 2
Systematic Name: (E)-diphenyldiazene 
SMILES: N(=N/c1ccccc1)\c2ccccc2 
InChI: InChI=1/C12H10N2/c1-3-7-11(8-4-1)13-14-12-9-5-2-6-10-12/h1-10H/b14-13+ 
InChIKey: DMLAVOWQYNRWNQ-BUHFOSPRBP 
Std. InChI: InChI=1S/C12H10N2/c1-3-7-11(8-4-1)13-14-12-9-5-2-6-10-12/h1-10H/b14-13+ 
Std. InChIKey: DMLAVOWQYNRWNQ-BUHFOSPRSA-N

 Azobenzene (103-33-3) was first described in 1856 as "gelblich-rote krystallinische Blättchen".Its original preparation is similar to the modern one. According to the 1858 method, nitrobenzene is reduced by iron filings in the presence of acetic acid. In the modern synthesis, zinc is the reductant in the presence of base.

IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 (1987),p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 8 (1975),p. 75.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; NCI Carcinogenesis Bioassay (feed); Clear Evidence: rat NCITR*    National Cancer Institute Carcinogenesis Technical Report Series. (Bethesda, MD 20014) No. NCI-CG-TR-154 ,1979. ; No Evidence: mouse NCITR*    National Cancer Institute Carcinogenesis Technical Report Series. (Bethesda, MD 20014) No. NCI-CG-TR-154 ,1979. . Reported in EPA TSCA Inventory.

Moderately toxic by ingestion and possibly other routes. Questionable carcinogen with experimental carcinogenic, neoplastigenic, and tumorigenic data. When heated to decomposition it emits toxic fumes of NO_x.
 

Hazard Codes: T,N,Xn,F
Risk Statements:
11:  Highly Flammable
20:  Harmful by inhalation
22:  Harmful if swallowed
23:  Toxic by inhalation
24:  Toxic in contact with skin
25:  Toxic if swallowed
38:  Irritating to the skin
39:  Danger of very serious irreversible effects
45:  May cause cancer
48:  Danger of serious damage to health by prolonged exposure
50:  Very Toxic to aquatic organisms
51:  Toxic to aquatic organisms
53:  May cause long-term adverse effects in the aquatic environment
60:  May impair fertility
62:  Possible risk of impaired fertility
65:  Harmful: May cause lung damage if swallowed
66:  Repeated exposure may cause skin dryness or cracking
67:  Vapors may cause drowsiness and dizziness
68:  Possible risk of irreversible effects
Safety Statements:
7:  Keep container tightly closed
16:  Keep away from sources of ignition - No smoking
29:  Do not empty into drains.
33:  Take precautionary measures against static discharges
36:  Wear suitable protective clothing 
37:  Wear suitable gloves
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)
53:  Avoid exposure - obtain special instruction before use
60:  This material and/or its container must be disposed of as hazardous waste
61:  Avoid release to the environment. Refer to special instructions safety data sheet
62:  If swallowed, do not induce vomiting: seek medical advice immediately and show this container or label

 Azobenzene (103-33-3) is an azo compound, and also can be called (E)-1,2-diphenyldiazene ; Diazene, 1,2-diphenyl-, (E)- ; Azobenzen ;and (E)-Diphenyldiazen .The term 'azobenzene' or simply 'azo' is often used to refer to a wide class of molecules that share the core azobenzene structure, with different chemical functional groups extending from the phenyl rings
It is hazardous,so the first aid measures and others should be known.Such as: When on the skin: first,should  flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly,Get shoesmedical aid . Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids.Then get medical aid soon.While ,it's Inhaled: Remove from exposure and move to fresh air immediately.Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Wash mouth out with water,and get medical aid immediately.
In addition, Azobenzene (103-33-3) can be stable under at normal temperature and pressure conditions.It is not compatible with strong oxidizing agents, and you must not take it with incompatible materials.And also prevent it to broken down into hazardous decomposition products: oxides of nitrogen, carbon dioxide, carbon monoxide.