Icosane

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Icosane
Skeletal formula of icosane
Ball and stick model of icosane
Identifiers
CAS number 112-95-8 YesY
PubChem 8222
ChemSpider 7929 YesY
UNII 3AYA9KEC48 YesY
EC number 204-018-1
MeSH eicosane
ChEBI CHEBI:43619 YesY
ChEMBL CHEMBL1233983 N
Beilstein Reference 1700722
Jmol-3D images Image 1
Properties
Molecular formula C20H42
Molar mass 282.55 g mol−1
Appearance Colorless, waxy crystals
Odor Odorless
Melting point 36 to 38 °C; 97 to 100 °F; 309 to 311 K
Boiling point 343.1 °C; 649.5 °F; 616.2 K
log P 10.897
kH 31 μmol Pa−1 kg−1
Thermochemistry
Specific
heat capacity
C
602.5 J K−1 mol−1 (at 6.0 °C)
Std molar
entropy
So298
558.6 J K−1 mol−1
Hazards
Flash point >113 °C
Related compounds
Related alkanes
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Icosane (alternative spelling eicosane) is an alkane with the chemical formula C20H42. It has 366,319 constitutional isomers.

Icosane has little use in the petrochemical industry, as its high flash point makes it an inefficient fuel. n-Icosane (the straight-chain structural isomer of icosane) is the shortest compound found in paraffin waxes used to form candles.

Icosane's size, state or chemical inactivity does not exclude it from the traits its smaller alkane counterparts have. It is a colorless, non-polar molecule, nearly non-reactive unless combusted. It is less dense than and insoluble in water. Its non-polar trait means it can only perform weak intermolecular bonding (hydrophobic/van der Waals forces).

Icosane's phase transition at a moderate temperature makes it a candidate phase change material, or PCM which can be used to store thermal energy and control temperature.

Naming[edit]

IUPAC currently recommends icosane,[2] whereas Chemical Abstracts Service and Beilstein use eicosane.[3]

References[edit]

  1. ^ "eicosane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 4 January 2012. 
  2. ^ "Table 11 Basic numerical terms (multiplying affixes)". IUPAC. Retrieved 2011-02-16. 
  3. ^ "Footnote for Table 11". IUPAC. Retrieved 2011-02-16. 

External links[edit]

  • Icosane at Dr. Duke's Phytochemical and Ethnobotanical Databases