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- Crown_ether abstract "Crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups. The most common crown ethers are oligomers of ethylene oxide, the repeating unit being ethyleneoxy, i.e., -CH2CH2O-. Important members of this series are the tetramer (n = 4), the pentamer (n = 5), and the hexamer (n = 6). The term "crown" refers to the resemblance between the structure of a crown ether bound to a cation, and a crown sitting on a person's head. The first number in a crown ether's name refers to the number of atoms in the cycle, and the second number refers to the number of those atoms that are oxygen. Crown ethers are much broader than the oligomers of ethylene oxide; an important group are derived from catechol.Crown ethers strongly bind certain cations, forming complexes. The oxygen atoms are well situated to coordinate with a cation located at the interior of the ring, whereas the exterior of the ring is hydrophobic. The resulting cations often form salts that are soluble in nonpolar solvents, and for this reason crown ethers are useful in phase transfer catalysis. The denticity of the polyether influences the affinity of the crown ether for various cations. For example, 18-crown-6 has high affinity for potassium cation, 15-crown-5 for sodium cation, and 12-crown-4 for lithium cation. The high affinity of 18-crown-6 for potassium ions contributes to its toxicity. Crown ethers are not the only macrocyclic ligands that have affinity for the potassium cation. Ionophores such as valinomycin also display a marked preference for the potassium cation over other cations.".
- Crown_ether thumbnail 18-crown-6-potassium-3D-balls-A.png?width=300.
- Crown_ether wikiPageExternalLink pedersen-lecture.pdf.
- Crown_ether wikiPageExternalLink crown_en.html.
- Crown_ether wikiPageID "1075926".
- Crown_ether wikiPageRevisionID "604001993".
- Crown_ether hasPhotoCollection Crown_ether.
- Crown_ether subject Category:Chelating_agents.
- Crown_ether subject Category:Crown_ethers.
- Crown_ether subject Category:Macrocycles.
- Crown_ether subject Category:Supramolecular_chemistry.
- Crown_ether type Abstraction100002137.
- Crown_ether type CrownEthers.
- Crown_ether type Element114840755.
- Crown_ether type Matter100020827.
- Crown_ether type Part113809207.
- Crown_ether type PhysicalEntity100001930.
- Crown_ether type Quintessence114847103.
- Crown_ether type Relation100031921.
- Crown_ether type Substance100019613.
- Crown_ether comment "Crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups. The most common crown ethers are oligomers of ethylene oxide, the repeating unit being ethyleneoxy, i.e., -CH2CH2O-. Important members of this series are the tetramer (n = 4), the pentamer (n = 5), and the hexamer (n = 6). The term "crown" refers to the resemblance between the structure of a crown ether bound to a cation, and a crown sitting on a person's head.".
- Crown_ether label "Crown ether".
- Crown_ether label "Eteri corona".
- Crown_ether label "Etery koronowe".
- Crown_ether label "Kronenether".
- Crown_ether label "Kroonether".
- Crown_ether label "Éter coroa".
- Crown_ether label "Éter de corona".
- Crown_ether label "Éther couronne".
- Crown_ether label "Краун-эфиры".
- Crown_ether label "クラウンエーテル".
- Crown_ether label "冠醚".
- Crown_ether sameAs Kronenether.
- Crown_ether sameAs Éter_de_corona.
- Crown_ether sameAs Éther_couronne.
- Crown_ether sameAs Eter_mahkota.
- Crown_ether sameAs Eteri_corona.
- Crown_ether sameAs クラウンエーテル.
- Crown_ether sameAs 크라운_에터.
- Crown_ether sameAs Kroonether.
- Crown_ether sameAs Etery_koronowe.
- Crown_ether sameAs Éter_coroa.
- Crown_ether sameAs m.043tm4.
- Crown_ether sameAs Q410125.
- Crown_ether sameAs Q410125.
- Crown_ether sameAs Crown_ether.
- Crown_ether wasDerivedFrom Crown_ether?oldid=604001993.
- Crown_ether depiction 18-crown-6-potassium-3D-balls-A.png.
- Crown_ether isPrimaryTopicOf Crown_ether.