Undecane
| Names | |
|---|---|
| Preferred IUPAC name
Undecane | |
| Identifiers | |
3D model (JSmol) |
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| 1697099 | |
| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.013.001 |
| EC Number |
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| MeSH | undecane |
PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 2330 |
CompTox Dashboard (EPA) |
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| Properties | |
| C11H24 | |
| Molar mass | 156.313 g·mol−1 |
| Appearance | Colorless liquid |
| Odor | Gasoline-like to Odorless |
| Density | 740 g/L |
| Melting point | −26 °C (−15 °F; 247 K) |
| Boiling point | 196 °C (385 °F; 469 K) |
| log P | 6.312 |
| Vapor pressure | 55 Pa (at 25 °C) |
Henry's law constant (kH) |
5.4 nmol Pa−1 kg−1 |
| −131.84·10−6 cm3/mol | |
Refractive index (nD) |
1.417 |
| Thermochemistry | |
Heat capacity (C) |
345.05 J K−1 mol−1 |
Std molar entropy (S⦵298) |
458.15 J K−1 mol−1 |
Std enthalpy of formation (ΔfH⦵298) |
−329.8 – −324.6 kJ mol−1 |
Std enthalpy of combustion (ΔcH⦵298) |
−7.4339 – −7.4287 MJ mol−1 |
| Hazards | |
| GHS labelling: | |
| Danger | |
| H304, H315, H319, H331, H335 | |
| P261, P301+P310, P305+P351+P338, P311, P331 | |
| NFPA 704 (fire diamond) | |
| Flash point | 60.0 °C (140.0 °F; 333.1 K) |
| 240 °C (464 °F; 513 K) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
> 2000 mg/kg (rat, oral) > 5000 mg/kg (rat, dermal) |
LC50 (median concentration) |
> 20 mg/L (rat, 8 hours) |
| Safety data sheet (SDS) | Fisher Scientific |
| Related compounds | |
Related alkanes |
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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 | |
Undecane (also known as hendecane) is a liquid alkane hydrocarbon with the chemical formula CH3(CH2)9CH3. It is used as a mild sex attractant for various types of moths and cockroaches, and an alert signal for a variety of ants. It has 159 isomers.
Undecane may also be used as an internal standard in gas chromatography when working with other hydrocarbons. Since the boiling point of undecane (196 °C) is well known, it may be used as a comparison for retention times in a gas chromatograph for molecules whose structure has been freshly elucidated. For example, if one is working with a 50 m crosslinked methyl silicone capillary column with an oven temperature increasing slowly, beginning around 60 °C, an 11-carbon molecule like undecane may be used as an internal standard to be compared with the retention times of other 10-, 11-, or 12- carbon molecules, depending on their structures.