What does crown ether mean?
Definitions for crown ether
crown ether
This dictionary definitions page includes all the possible meanings, example usage and translations of the word crown ether.
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Wiktionary
crown ethernoun
any of a class of macrocyclic compounds containing repeat units of -CHCHO-
crown ethernoun
any similar compound containing atoms of nitrogen, sulphur, phosphorus or silicon instead of, or as well as, oxygen
Wikidata
Crown ether
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, the pentamer, and the hexamer. 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.
Numerology
Chaldean Numerology
The numerical value of crown ether in Chaldean Numerology is: 8
Pythagorean Numerology
The numerical value of crown ether in Pythagorean Numerology is: 3
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"crown ether." Definitions.net. STANDS4 LLC, 2024. Web. 21 Dec. 2024. <https://www.definitions.net/definition/crown+ether>.
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