crown

https://doi.org/10.1351/goldbook.C01421
A molecular entity comprising a monocyclic ligand assembly that contains three or more binding sites held together by covalent bonds and capable of binding a guest in a central (or nearly central) position. The adducts formed are sometimes known as 'coronates'. The best known members of this group are macrocyclic polyethers, such as '18-crow chemimgn-6', containing several repeating units –CR2–CR2O– (where R is most commonly H), and known as crow chemimgn ethers.
C01421.png
See also: host
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1101 (https://doi.org/10.1351/pac199466051077)
See also:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1328 (https://doi.org/10.1351/pac199567081307)