Methylene iodide
Diiodomethane
CAS: 75-11-6
Molecular Formula: CH2I2
Methylene iodide - Names and Identifiers
| Name | Diiodomethane |
| Synonyms | Diiodmethane Diiodomethane Di-iodomethane Methylene iodide 1,1-diiodomethane Methylene diiodide Diiodomethane, stabilized Diiodomethane (stabilized with Copper chip) |
| CAS | 75-11-6 |
| EINECS | 200-841-5 |
| InChI | InChI=1/CH2I2/c2-1-3/h1H2 |
Methylene iodide - Physico-chemical Properties
| Molecular Formula | CH2I2 |
| Molar Mass | 267.84 |
| Density | 3.325g/mLat 25°C(lit.) |
| Melting Point | 6 °C |
| Boling Point | 67-69°C11mm Hg(lit.) |
| Flash Point | 181°C |
| Water Solubility | 14 g/L (20 ºC) |
| Solubility | 0.8g/l |
| Vapor Presure | 1.13mmHg at 25°C |
| Vapor Density | 9.25 (vs air) |
| Appearance | Liquid |
| Specific Gravity | 3.325 |
| Color | deep yellow |
| Merck | 14,6066 |
| BRN | 1696892 |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Incompatible with strong oxidizing agents, strong bases. Reacts violently with alkali metal salts. May discolour on exposure to light. |
| Sensitive | Light Sensitive |
| Refractive Index | 1.737 |
| Physical and Chemical Properties | Appearance and properties colorless clear to light yellow liquid density 3.325 melting point 6°C boiling point 181°C refractive index 1.737 water-soluble 14g/L (20°C) |
| Use | Used as analytical reagents, but also for organic synthesis |
Methylene iodide - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R22 - Harmful if swallowed R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| UN IDs | 2810 |
| WGK Germany | 3 |
| RTECS | PA8575000 |
| FLUKA BRAND F CODES | 8 |
| TSCA | Yes |
| HS Code | 29033080 |
| Hazard Class | 6.1 |
| Packing Group | III |
| Toxicity | LD50 orally in Rabbit: 76 mg/kg |
Methylene iodide - Nature
Open Data Verified Data
Heavy high refractive index yellow liquid. Soluble in about 70 times of water, and ethanol, ether, propanol, isopropanol, hexane, cyclohexane, chloroform and benzene miscible. Soluble sulfur and phosphorus (more than 1:1 at 25 °c). It is easy to decompose in air, and it is easy to turn black when exposed to light, air and moisture. Relative density (d20)3. 3254. Melting point 5.7 °c. Crystallization usually begins when cooled to 0 °c. Boiling point 180 degrees C (decomposition). Refractive index 7425. Viscosity (10 deg C) 3.35mPa.s.
Last Update：2024-01-02 23:10:35
Methylene iodide - Preparation Method
Open Data Verified Data
- iodoform-sodium arsenite method: first, sodium arsenite is prepared by reacting arsenic trioxide with liquid alkali, and then the mixture is mixed with iodoform and sodium arsenite solution and heated to 60~65 ℃ under stirring, further, sodium hydroxide was added for one-step reaction to prepare diiodomethane. The reaction product was washed with water, distilled, decolorized, crystallized, separated and dried to obtain a finished product.
- The iodoform method is obtained by the interaction with sodium acetate, and the finished product is obtained by distillation.
- phase transfer catalytic synthesis using triethylbenzylammonium chloride as catalyst, obtained by the reaction of dichloromethane and sodium iodide.
Last Update：2022-01-01 10:13:59
Methylene iodide - Use
Open Data Verified Data
organic synthesis raw materials, chemical reagents and pharmaceutical intermediates can be used for the manufacture of X-ray contrast agents, the determination of mineral density and refractive index, and the separation of minerals.
Last Update：2022-01-01 10:13:59
Methylene iodide - Safety
Open Data Verified Data
toxic. Less narcotic than dibromomethane, post-olfactory Head Pain, Dyspnea. See dibromomethane. Packed in brown glass bottles, 5kg per bottle. The bottle was wrapped with light-shielding paper.
Last Update：2022-01-01 10:14:00
Methylene iodide - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| purpose | This product is organic synthesis raw materials, chemical reagents and pharmaceutical intermediates, can be used for the manufacture of X-ray contrast agent, determination of mineral relative density and refractive index, verification of pyridine, and separation of minerals. used as analytical reagent, also used in organic synthesis used in organic synthesis and separation of mixed minerals |
| production method | the reaction of iodoform with sodium acetate in ethanol. After the reaction, diiodomethane was obtained by distillation. It can also be prepared by the following method. 1. Iodoform-sodium arsenite method first uses arsenic trioxide and liquid alkali reaction to prepare sodium arsenite, and then by iodoform, sodium arsenite solution mixing, under stirring heating to 60-65 ℃, and then sodium hydroxide one-step reaction to prepare diiodomethane. The reaction product was washed with water, distilled, decolorized, crystallized, separated and dried to obtain a finished product. 2. Iodoform method by sodium acetate derived. Phase transfer catalytic synthesis using triethylbenzylammonium chloride as catalyst, obtained by the reaction of dichloromethane and sodium iodide. |
| category | toxic substances |
| toxicity grade | high toxicity |
| Acute toxicity | intraperitoneal-rat LD50: 403 mg/kg; Intraperitoneal-mouse LD50: 467 mg/kg |
| flammability hazard characteristics | Thermal decomposition; Toxic iodide smoke from combustion |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from oxidants and food additives |
| fire extinguishing agent | water, foam, carbon dioxide, sand |
Last Update：2024-04-09 02:00:11
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