cryptand


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cryptand

[′krip‚tand]
(organic chemistry)
A macropolycyclic polyazo-polyether, where the three-coordinate nitrogen atoms provide the vertices of a three-dimensional structure.
References in periodicals archive ?
Notably, PSC-derived human organoids are organized into cryptand villus-like domains, contain the major differentiated epithelial cell types, and, interestingly, are enveloped by a sheath of mesenchyme, comprised of myofibroblasts and smooth muscle cells, thus recapitulating an additional aspect of the ISC niche.
Keywords: Metal picrate; Cryptand; Transition metal cation; Solvent extraction.
The unique potassium ([K.sup.+]) sensor on this system consists of a macrocyclic ion-selective cryptand covalently coupled to an o-alkoxyaniline fluorophore.
and used as obtained, including 18-Crown-6, Benzo-18-crown-6, Dibenzo-18-crown-6, cis-Dicyclohexano-18-crown-6, [2.2.2] cryptand (4,7,13,16,21,24-hexaoxa1 1, 10-diaza-bicyclo[8.8.8]-hexacosane), styrene, and 2,2'-azobisisobutyronitrile (AIBN).
Syntheses centre on macrocyclic ligands of the crown ether or cryptand type and related complexing agents.
Polyaza macrobicyclic cryptands: synthesis, crystal structures of a cyclophane type macrobicyclic cryptand and of its dinuclear copper(I) cryptate, and anion binding features.
and Kerdjoudj, H.: 2004, Removal of Ag(I), Cu(II) and Zn(II) ions with a supported liquid membrane containing cryptands as carriers, Desalination 161, 295-303.
The two authors hope to guide readers to see "...their inherent beauty and aesthetic appeal." Coverage encompasses cyclophnes; crown ethers, cryptands, and other compounds; calixarenes; heterocalixaresn and calixnaphthalenes; cyclodextrins; cyclotriveratylenes and cryptophnes; cucurbiturils; rotaxanes and catemanes; and other supramolecular systems, molecular motors, machines, and nanotechnological applications.
After dealing with preliminaries he presents a section on moieties within molecules, discussing crown ethers, cryptands, and related molecules as hosts; cyclodextrins and some analogs as hosts; and crystal chemistry of some DNA oligonucleotides and their complexes.
The correctness of these assumptions has already been showed for some macrocyclic ligands such as benzo and aza crown ethers cryptands and cucurbit[n]urils [19-23].
Polyammonium cryptands are bicyclic compounds, which are suitable for encapsulating anion in the cavity center.