Methylene (compound)
Methylene (IUPAC name: Methylidene, also called carbene or methene) is an organic compound with the chemical formula CH
2 (also written [CH
2]). It is a colourless gas that fluoresces in the mid-infrared range, and only persists in dilution, or as an adduct.
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| Names | |||
|---|---|---|---|
| IUPAC name
Dihydridocarbon(2•) | |||
| Preferred IUPAC name
Methylidene | |||
| Other names | |||
| Identifiers | |||
3D model (JSmol) |
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| 1696832 | |||
| ChEBI | |||
| ChemSpider | |||
| 56 | |||
| MeSH | carbene | ||
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |||
| CH 22• | |||
| Molar mass | 14.0266 g mol−1 | ||
| Appearance | Colourless gas | ||
| Reacts | |||
| Conjugate acid | Methenium | ||
| Thermochemistry | |||
Std molar entropy (S⦵298) |
193.93 J K−1 mol−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
386.39 kJ mol−1 | ||
| Related compounds | |||
Related compounds |
Methyl (CH3) Methylidyne (CH) Carbide (C) Silylene (SiH2) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
Methylene is the simplest carbene.: p.7 It is usually detected only at very low temperatures, or as a short-lived intermediate in chemical reactions.
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