Diiodomethane

  • Methylene diiodide
  • Methane, diiodo
Formula
CH2I2
Structure
Description
Colorless liquid which darkens upon exposure to light, air and moisture.
Uses
Substance is used in separating mixtures of minerals.

Registry Numbers and Inventories.
CAS
75-11-6
EC (EINECS/ELINCS)
200-841-5
R 20/21/22 36/37/38
S 26 36/37/39
RTECS
PA8575000
RTECS class
Mutagen; Human Data
UN (DOT)
2810
Merck
12,6143
Beilstein/Gmelin
1696892
Beilstein Reference
4-01-00-00096
Swiss Giftliste 1
G-2455
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
CH2I2
Formula mass
267.84
Melting point, °C
6
Boiling point, °C
182
Vapor pressure, mmHg
141 (0 C)
Vapor density (air=1)
9.25
Saturation Concentration
14476 mm Hg at 68 C (calc.)
Critical temperature
462
Critical pressure
64.84
Density
3.32537 g/cm3 (20 C)
Solubility in water
14 g/L
Viscosity
2.80 cP
Surface tension
51.4 g/s2 (20 C)
Refractive index
1.7559 (20 C)
Heat of fusion
46.89 kJ/mol
Heat of vaporization
45.6 kJ/mol
Heat of combustion
-746.9 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Store in opaque, air-tight containers.
D2B
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Do not get on skin or in eyes. Do not ingest or inhale. Store protected from light.
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 impervious gloves. 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
Neutralize spill with sodium bicarbonate. Remove all sources of ignition. Absorb spill using an absorbent, non-combustible material such as earth, sand, or vermiculite. Carefully scoop up and place into appropriate disposal container. Provide ventilation.
Disposal code
2
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Alkenes + diethyl zinc, copper-zinc alloys + ether, lithium, potassium, potassium-sodium alloys, strong oxidizing agents, strong bases, light.
Decomposition
Carbon monoxide, carbon dioxide, hydrogen iodide.

Fire.
Flash Point,°C
104
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. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Extinguishing media: Use foam, dry chemical, or carbon dioxide. Use agent most appropriate to extinguish fire. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
4
Exposure effects
Chronic exposure can lead to iodism characterized by salivation, nasal discharge, sneezing, conjunctivitis, fever, laryngitis, bronchitis, stomatitis, and skin rashes.
   Ingestion
May cause irritation of the digestive tract. May cause liver and kidney damage. 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.
   Inhalation
May cause respiratory tract irritation. May cause effects similar to those described for ingestion.
   Skin
May cause skin irritation. Prolonged and/or repeated contact may cause irritation and/or dermatitis.
   Eyes
May cause eye irritation.

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 not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.

Transport.
UN number
2810
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
36. Halogenated hydrocarbons
HS Code
2903 30 80