21-Crown-7 is an organic compound with the formula [C2H4O]7 and the IUPAC name 1,4,7,10,13,16,19-heptaoxacycloheneicosane. Similar to other crown ethers, 21-crown-7 functions as a ligand for certain metal cations, with a specific affinity for caesium cations.[1] The dipole moment of 21-crown-7 varies depending on the solvent and temperatures.

21-Crown-7
Skeletal formula
Names
Preferred IUPAC name
1,4,7,10,13,16,19-Heptaoxacyclohenicosane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.046.689 Edit this at Wikidata
EC Number
  • 251-373-3
UNII
  • InChI=1S/C14H28O7/c1-2-16-5-6-18-9-10-20-13-14-21-12-11-19-8-7-17-4-3-15-1/h1-14H2 checkY
    Key: XKEHLMZHBXCJGZ-UHFFFAOYSA-N checkY
  • InChI=1S/C14H28O7/c1-2-16-5-6-18-9-10-20-13-14-21-12-11-19-8-7-17-4-3-15-1/h1-14H2
    Key: XKEHLMZHBXCJGZ-UHFFFAOYSA-N
  • O1CCOCCOCCOCCOCCOCCOCC1
Properties
C14H28O7
Molar mass 308.371 g·mol−1
Related compounds
Related compounds
Dibenzo-21-crown-7
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

References

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  1. ^ Frensdorff, Hans K. (1 February 1971). "Stability constants of cyclic polyether complexes with univalent cations". Journal of the American Chemical Society. 93 (3): 600–606. doi:10.1021/ja00732a007.
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