crown ether वाक्य
उदाहरण वाक्य
मोबाइल
- Cerium nitrates also form 4 : 3 and 1 : 1 complexes with 18-crown-6 ( the ratio referring to that between cerium and the crown ether ).
- Finally, X-ray crystallography had a pioneering role in the development of supramolecular chemistry, particularly in clarifying the structures of the crown ethers and the principles of host-guest chemistry.
- Although the molecular shape defines a cage, no void space is available at the interior for binding other atoms or molecules, unlike crown ethers or larger cryptand structures.
- They remain trapped in cages or channels within the compound's crystalline structure by large ringlike molecules, such as crown ethers, made from carbon and oxygen or nitrogen atoms.
- An enhanced fluorescence signal is observed only in the presence of excess protons, zinc and sodium ions through interactions with their respective amine, phenyldiaminocarboxylate and crown ether receptors.
- 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.
- Some compounds can considerably increase or decrease the solubility of AgX . Examples of compounds that increase the solubility include : cyanide, thiocyanate, thiosulfate, thiourea, amines, ammonia, sulfite, thioether, crown ether.
- The catalyst makes use the crown ether motif's ability to capture cation to bind to the ammonium ion part of the substrate and subsequently employs the nearby thiol motif to cleave the ester.
- 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.
- If an organic solution of permanganate is desired, " purple benzene " may be prepared, either by treating a two phase mixture of aqueous potassium permanganate and benzene with a quaternary ammonium salt, or by sequestering the potassium cation with a crown ether.
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