Imidazole

  • 1,3-Diaza-2,4-cyclopentadiene
  • 1,3-Diazole
  • Glyoxalin
  • Miazole
Formula
C3H4N2
Structure
Description
White to yellow solid with an amine odor.

Registry Numbers and Inventories.
CAS
288-32-4
EC (EINECS/ELINCS)
206-019-2
EC Class
harmful, corrosive
R 22 34
S 26 36/37/39 45
RTECS
NI3325000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Reproductive Effector
UN (DOT)
1759
Merck
13,4935
Beilstein/Gmelin
103853
Beilstein Reference
5-23-04-00191
Swiss Giftliste 1
G-3311
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H4N2
Formula mass
68.08
Melting point, °C
89 - 90
Boiling point, °C
255
Vapor pressure, mmHg
0.024 (25 C)
Vapor density (air=1)
2.36
Density
1.18 g/cm3
Solubility in water
Very soluble
Surface tension
36.82 g/s2 (110 C)
Refractive index
1.48075 (95 C)
pKa/pKb
7.05 (pKb)
Partition coefficient, pKow
-0.31
Heat of fusion
12.8 kJ/mol
Heat of vaporization
47.5 kJ/mol
Heat of combustion
-1802 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Keep container tightly closed. Do not get on skin or in eyes. 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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Acids, acid anhydrides, strong oxidizing agents.
Decomposition
Hydrogen cyanide, nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, ammonia.

Fire.
Flash Point,°C
145
Autoignition, °C
480
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use extinguishing media most appropriate for the surrounding fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Laboratory experiments have resulted in mutagenic effects. May cause reproductive effects.
   Ingestion
Harmful if swallowed. Causes digestive tract irritation with possible burns.
   Inhalation
Causes respiratory tract irritation with possible burns.
   Skin
Exposure may cause irritation and possible burns. May be absorbed through the skin.
   Eyes
Contact with eyes may cause severe irritation, and possible eye burns.

First aid
 
   Ingestion
Do NOT induce vomiting. 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 breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately 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
1759
Response guide
Hazard class
8
Packing Group
I; II; III
 
HS Code
2933 29 90