cryptands การใช้

• Shortly after crown compounds, cryptands, were reported by Lehn and co-workers.
• Lithium ions may be chemically removed by binding to species such as cryptands or crown ethers.
• Such salts can be isolated by the addition of macrocyclic ligands such as crown ether and cryptands.
• However, with the help of cryptands and methylamine, pure may be obtained as red crystals isostructural to [ [ sodium nitrite | ] ].
• Chemists use the study of intramolecular and intermolecular cooperativity in supramolecular assemblies and macrocyclic compounds such as crown ethers and cryptands, which can act as hosts to guest molecules.
• In 1980, he was elected to become a teacher at the prestigious Coll鑗e de France, and in 1987 was awarded the Nobel Prize, alongside Donald Cram and Charles Pedersen for his works on cryptands.
• Cage-like molecules ( cryptands, crown ethers, buckyballs ) would be interesting exceptions : solute fits inside a single " solvent " cage, but it's perhaps rigid and so cannot change size / shape when the solute is present vs absent.
• Since the discovery of crown ethers and cryptands by Lehn ( for which they received the Nobel Prize in 1987 ), the significance of molecules containing the repeat units-CH 2-CH 2-O-as coordinating ligands for metal cations has been recognised.
• These cryptands, as Lehn dubbed them, became his main center of interest, and led to his definition of a new type of chemistry, " supramolecular chemistry ", which instead of studying the bonds inside one molecule, looks at intermolecular attractions, and what would be later called " fragile objects ", such as micelles, polymers, or clays.