Cryptand - an overview | ScienceDirect Topics
A cryptand is defined as a macrobicyclic compound with structural features that allow it to form inclusion complexes by accommodating guests such as cations, anions, or neutral molecules inside its cavity.
What is the Difference Between Crown Ethers and Cryptands
2023年12月14日 · The main difference between crown ethers and cryptands is that crown ethers typically form complexes with metal cations by encapsulating them within the ring, while cryptands have additional arms that can surround the metal ion, providing more secure coordination and often higher selectivity for specific ions.
Like crown ethers, cryptands were designed and synthesized as binding receptors of smaller molecular substrates. A simple definition of a cryptand is a bicyclic (or polycyclic) ligand.1 This definition was derived from Lehn's observations of the behavior of cryptands with alkali metals.
18.7: Crown Ethers - Chemistry LibreTexts
Cryptands (from the Greek kryptós, meaning “hidden”) are variations of crown ethers comprised of two nitrogens connected by three polyether strands. A common nomenclature is used where the numbers preceding the word cryptan indicate the number of oxygen atoms in …
Cryptand - an overview | ScienceDirect Topics
Cryptands are macro-bi- or -poly-cycles able to encapsulate an ion by providing it higher protection because of their cagelike structures, as in (147) and (148). For these ligands the correspondence between cavity size and complex stability is more pronounced than for …
Cryptand - chemeurope.com
The term cryptand implies that this ligand binds substrates in a crypt, interring the guest as in a burial. These molecules are three dimensional analogues of crown ethers but are more selective and complex the guest ions more strongly.
Crown Ethers and Cryptands - Royal Society of Chemistry
1991年8月9日 · Crown Ethers and Cryptands introduces the broad and basic principles of crown ether and cryptand chemistry at the advanced undergraduate, graduate and working professional level.
Cryptand - an overview | ScienceDirect Topics
A cryptand is defined as a type of molecule that is often utilized as a host for electron-deficient species like pyridinium, bipyridinium, and ammonium ions. It is characterized by its structural analyses using techniques such as X-ray crystallography, mass spectrometry, and …
Cryptands - (Organic Chemistry) - Vocab, Definition ... - Fiveable
Cryptands are a class of macrocyclic organic compounds that are capable of encapsulating and complexing with various cations, forming stable host-guest complexes. They are structurally similar to crown ethers but have a more rigid and three-dimensional structure, allowing them to selectively bind and transport specific ions.
Function-Oriented Molecular Design: Cryptand - Wiley Online …
2017年4月9日 · It summaries eleven types of cryptands that are classified in the shape or function. The chapter introduces Lehn's pioneering cryptands and carbon-bridge heads cryptands. It also describes phenolic OH and pyridine-containing cryptands, as …
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