21-Crown-7 is an organic compound with the formula [C2H4O]7 and the IUPAC name of 1,4,7,10,13,16,19-heptaoxacycloheneicosane. Like other crown ethers, 21-crown-7 functions as a ligand for some metal cations with a particular affinity for caesium cations.[1] The point group of 21-crown-7 is S7. The dipole moment of 21-crown-7 varies in different solvents and under different temperatures.

21-Crown-7
Skeletal formula
Names
IUPAC name
1,4,7,10,13,16,19-heptaoxacycloheneicosane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.046.689
EC Number 251-373-3
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).
Infobox references

ReferencesEdit

  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.

External linksEdit