Chemical Name: Diiodomethane
Synonyms: Methylene iodide, Méthylène iodure
CAS Number: 75-11-6
EC Number: 200-838-9
Molecular Formula: CH2I2
Molecular Weight: 267.84 g/mol
Recommended Use: Laboratory reagent, research chemical, density determination
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GHS Classification: Acute Toxicity Oral (Category 3), Acute Toxicity Inhalation (Category 3), Acute Toxicity Dermal (Category 3), Skin Irritation (Category 2), Eye Irritation (Category 2A), Specific Target Organ Toxicity - Single Exposure (Category 3)
Hazard Statements: Toxic if swallowed, in contact with skin or if inhaled. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Pictograms: Skull and crossbones, Exclamation mark
Signal Word: Danger
Precautionary Statements: Avoid breathing vapors or mists. Use only outdoors or in a well-ventilated area. Wear protective gloves, clothing, and eye protection. Wash thoroughly after handling.
Other Hazards: Contact with water liberates toxic iodine vapors. May darken on exposure to light due to decomposition.
Substance: Diiodomethane
Content: >99%
Chemical Formula: CH2I2
CAS No.: 75-11-6
Impurities: Trace levels of iodomethane, iodine (typically less than 0.1%)
Inhalation: Move person to fresh air immediately. Provide oxygen or artificial respiration if breathing is difficult. Seek immediate medical attention.
Skin Contact: Remove contaminated clothing and wash exposed area with soap and plenty of water for at least 15 minutes. Seek medical attention for persistent irritation.
Eye Contact: Rinse cautiously with water for at least 15 minutes, lifting eyelids to ensure thorough flushing. Remove contact lenses if present and easy to do so. Get medical help immediately.
Ingestion: Rinse mouth thoroughly. Do not induce vomiting. Never give anything by mouth to an unconscious person. Get medical attention at once.
Symptoms/Effects: Burning sensation, coughing, headache, nausea, vertigo, respiratory difficulty, skin redness, eye watering.
Suitable Extinguishing Media: Dry chemical, carbon dioxide, alcohol-resistant foam, or water spray (use water spray only to cool containers; substance itself does not burn easily)
Specific Hazards: May evolve corrosive hydrogen iodide, iodine vapors, and carbon oxides on thermal decomposition
Protective Equipment: Firefighters should wear full protective clothing and self-contained breathing apparatus
Special Precautions: Keep containers cool by spraying with water. Move containers from fire area if possible without risk.
Personal Precautions: Evacuate non-essential personnel, ventilate area thoroughly, avoid breathing vapors, avoid skin and eye contact, wear suitable PPE including gloves, goggles, and a respirator
Environmental Precautions: Prevent material from entering sewers, surface or ground water, and soil. Notify authorities in the event of a large spill.
Spill Cleanup: Absorb with inert material such as sand, earth, or vermiculite. Scoop up and place in a sealed, labeled container for disposal. Wash spill site with plenty of water after cleanup. Do not use metal tools as diiodomethane is corrosive to metals on prolonged contact.
Precautions for Safe Handling: Handle in a chemical fume hood. Avoid contact with skin, eyes, and clothing. Avoid breathing vapors. Remove contaminated clothing and wash before reuse. Use smallest possible amount for work and avoid spillage.
Conditions for Safe Storage: Store in a tightly closed amber glass bottle in a cool, dry, and well-ventilated area away from sunlight and sources of heat or ignition. Keep away from strong oxidizers, strong bases, metals, and reducing agents. Protect containers from damage and check regularly for leakage or signs of deterioration.
Storage Class: Toxic substances, Keep away from incompatible materials (alkalis, metals).
Exposure Limits: No specific occupational exposure limits set by ACGIH, OSHA, or NIOSH. Minimize exposure as much as possible due to high acute toxicity.
Engineering Controls: Use chemical fume hood, ensure wash stations and safety showers are accessible, local exhaust ventilation recommended
Personal Protection: Wear chemical-resistant gloves (nitrile or neoprene), protective clothing, eye protection (chemical safety goggles), and an appropriate respirator for volatile organics if exposure limits expected to be exceeded
Hygiene Measures: Do not eat, drink, or smoke while using this chemical. Wash hands thoroughly after handling. Remove and wash contaminated clothing before reuse.
Appearance: Colorless to pale yellow oily liquid, darkens on exposure to light
Odor: Sweet, penetrating odor
pH: Not applicable (non-aqueous)
Melting Point: 5.8 °C (42.4 °F)
Boiling Point: 181-182 °C (357-360 °F)
Flash Point: 77 °C (170.6 °F, closed cup)
Vapor Pressure: 0.13 mmHg at 25 °C
Density: 3.325 g/cm³ at 20°C (one of the highest densities for a liquid compound at room temperature)
Solubility: Slightly soluble in water, miscible with ethanol, ether, and chloroform
Partition Coefficient (Log Pow): Approximately 2.3
Decomposition: Exposure to light and air promotes decomposition to free iodine and hydrogen iodide, which stain the liquid brown or purple
Viscosity: 2.5 cP at 25 °C
Stability: Stable under recommended storage conditions, unstable in the presence of light, moisture, or at elevated temperatures
Incompatible Materials: Strong oxidizers, alkalis, bases, reducing agents, and reactive metals
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, hydrogen iodide, iodine vapor, traces of phosgene
Polymerization: No hazardous polymerization expected
Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Acute Toxicity: Oral LD50 (rat): 100 mg/kg. Inhalation LC50 (rat, 4hr): approx. 250 ppm. Skin LD50 (rabbit): 316 mg/kg.
Chronic Effects: Prolonged or repeated exposure may result in liver and kidney damage, effects on central nervous system.
Symptoms: Irritation, coughing, dizziness, nausea, vomiting, headache, fatigue, skin defatting, eye burns
Mutagenicity: Classified as a possible mutagen based on limited evidence
Carcinogenicity: Not classified as a human carcinogen by IARC, NTP, or OSHA
Reproductive Effects: Data not sufficient for classification
Ecotoxicity: Highly toxic to aquatic life with short-term effects (LC50 fish, 96hr, Lepomis macrochirus: 6 mg/L). Not easily biodegradable.
Persistence: High persistence and bioaccumulation potential due to low degradability and high log Kow
Mobility in Soil: Low mobility, adsorbs strongly to soil and organic material
Degradability: Slow degradation in environment, may photodegrade to release iodine
Other Adverse Effects: Accumulation in water bodies results in risk to aquatic organisms, may also affect soil microorganisms.
Disposal Method: Dispose of as hazardous waste in accordance with local, regional, and national regulations. Consult a licensed professional waste disposal service.
Container Disposal: Triple rinse empty containers, puncture, and send to an approved chemical landfill or incineration facility.
Precautions: Do not discharge into drains, water courses, or onto the ground. Avoid all release to the environment.
UN Number: UN 2810
Proper Shipping Name: Toxic liquid, organic, n.o.s. (contains Diiodomethane)
Hazard Class: 6.1 (Toxic substances)
Packing Group: II
Marine Pollutant: Yes
Special Precautions: Keep packaging tightly closed and upright. Ensure transport vehicle is well-ventilated and goods are separated from food and animal feed.
TSCA Inventory: Listed
REACH Status: Registered or pre-registered in the EU
OSHA Hazardous Chemical: Yes
California Proposition 65: Not listed
SARA 313: Not subject to reporting requirements
Other Regulations: Subject to local and international transport regulations due to toxicity and environmental hazard. Follow all workplace notification laws, storage limits, and waste management codes for toxic chemicals.
