Diiodomethane
Diiodomethane or methylene iodide, commonly abbreviated "MI", is an organoiodine compound. Diiodomethane is a very dense colorless liquid; however, it decomposes upon exposure to light liberating iodine, which colours samples brownish. It is slightly soluble in water, but soluble in organic solvents. It has a very high refractive index of 1.741, and a surface tension of 0.0508 N·m−1.
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| Names | |||
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| Preferred IUPAC name
Diiodomethane | |||
| Identifiers | |||
3D model (JSmol) |
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| 1696892 | |||
| ChemSpider | |||
| ECHA InfoCard | 100.000.765 | ||
| EC Number |
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| MeSH | methylene+iodide | ||
PubChem CID |
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| RTECS number |
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| UNII | |||
CompTox Dashboard (EPA) |
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SMILES
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| Properties | |||
| CH2I2 | |||
| Molar mass | 267.836 g·mol−1 | ||
| Appearance | Colorless liquid | ||
| Density | 3.325 g mL−1 (3325 kg/m3) | ||
| Melting point | 5.4 to 6.2 °C; 41.6 to 43.1 °F; 278.5 to 279.3 K | ||
| Boiling point | 182.1 °C; 359.7 °F; 455.2 K | ||
| 1.24 g L−1 (at 20 °C) | |||
Henry's law constant (kH) |
23 μmol Pa−1 kg−1 | ||
Magnetic susceptibility (χ) |
-93.10·10−6 cm3/mol | ||
| Structure | |||
| Tetragonal | |||
Molecular shape |
Tetrahedron | ||
| Thermochemistry | |||
Heat capacity (C) |
133.81 J K−1 mol−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
67.7–69.3 kJ mol−1 | ||
Std enthalpy of combustion (ΔcH⦵298) |
−748.4–−747.2 kJ mol−1 | ||
| Hazards | |||
| GHS labelling: | |||
| Danger | |||
| H302, H315, H318, H335 | |||
| P261, P280, P305+P351+P338 | |||
| NFPA 704 (fire diamond) |
3
1
0 | ||
| Flash point | 110 °C (230 °F; 383 K) | ||
| Safety data sheet (SDS) | hazard.com | ||
| Related compounds | |||
Related alkanes/haloalkanes |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
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