4-dimethylaminoazobenzene

  • Butter yellow
  • Methyl yellow
  • N,N-Diemthyl-4-(Phenylazo)benzenamine
  • p-Dimethylaminoazobenzene
Formula
C14H15N3
Structure
Description
Yellow crystal leaflets.
Uses
For determination of free hydrochloric acid in gastric juice, spot test identification of peroxidized fats, ph indicator (red 2.9, Yellow 4.0).

Registry Numbers and Inventories.
CAS
60-11-7
EC (EINECS/ELINCS)
200-455-7
EC Class
toxic, carcinogenic
R 25 40
S 36/37 45
RTECS
BX7350000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
3143
Merck
12,3279
Beilstein/Gmelin
746016
Beilstein Reference
4-10-00-01698
RCRA
U093
Swiss Giftliste 1
G-4659
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C14H15N3
Formula mass
225.30
Melting point, °C
113 - 117
Boiling point, °C
371
Vapor pressure, mmHg
1E-5 (25 C)
Vapor density (air=1)
7.78
Density
1.2233 g/cm3
Solubility in water
Insoluble
pKa/pKb
10.45 (pKb)
Partition coefficient, pKow
4.58
Heat of vaporization
61.8 kJ/mol
Heat of combustion
-7995 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Poison room locked. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.
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
Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation. Do not get water inside containers. Cover with dry earth, dry sand, or other non-combustible material followed with plastic sheet to minimize spreading and contact with water. Stop leak only if you can do so without risk.
Disposal code
9
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Acids - acid anhydrides - oxidizing agents.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.

Fire.
Flash Point,°C
178
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Substance is noncombustible. Decomposes at high temperatures, resulting in toxic and corrosive products. Containers may explode when heated. Extinguishing media: Do NOT get water inside containers. Do NOT use straight streams of water. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use water spray, fog or regular foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
This material is probably combustible.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
NIOSH REL: Ca See Appendix A OSHA PEL: [1910.1015] See Appendix B
Carcinogin
O, I-2B, N-2, CP65
Poison_Class
1*
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
Harmful if swallowed. May cause digestive tract disturbances.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause severe skin irritation.
   Eyes
Contact with eyes may cause severe irritation, and possible eye burns.

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. Remove contaminated clothing and shoes.
   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
3143
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
DAZ
 
HS Code
2927 00 00