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| Names | |
|---|---|
| Preferred IUPAC name
Undecane[1] | |
| 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 mg mL−1 |
| Melting point | −26.6 to −25.0 °C; −15.8 to −12.9 °F; 246.6 to 248.2 K |
| Boiling point | 193 to 197 °C; 379 to 386 °F; 466 to 470 K |
| log P | 6.312 |
| Vapor pressure | 55 Pa (at 25 °C)[2] |
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: | |
 
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| Danger | |
| H304, H315, H319, H331, H335 | |
| P261, P301+P310, P305+P351+P338, P311, P331 | |
| Flash point | 62.0 °C (143.6 °F; 335.1 K) |
| 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).
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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.[3] It has 159 isomers.[4]
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.