undecane

Also known as n-undecane, hendecane

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.

Chemical data

Formula: C11H24
Molecular weight: 156.31 g/mol
IUPAC name: undecane
SMILES: CCCCCCCCCCC
InChIKey: RSJKGSCJYJTIGS-UHFFFAOYSA-N
XLogP: 5.6
Polar surface area: 0 Å²
H-bond donors: 0
H-bond acceptors: 0
Formal charge: 0

via PubChem

Wikidata facts

Mass: 156.188

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canonical SMILES: CCCCCCCCCCC
chemical formula: C₁₁H₂₄
Commons category: Undecane
refractive index: 1.4164
density: 0.7402
melting point: -26.0
boiling point: 195.9
standard enthalpy of formation: -326
solubility: 0.000004
vapor pressure: 0.05
flash point: 69
surface tension: 17.45
dynamic viscosity: 0.433
ionization energy: 9.56

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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.