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 ?
It is well known that the extractability of metal ions with macrocylic reagents such as crown ether and cryptand is governed by the stability of the metal complexes [17].
Previous researches on the macrocyclic ligands have provided insight into the interaction of metal cations with crown and cryptand ethers containing mixed donor atoms.
sensor on this system consists of a macrocyclic ion-selective cryptand covalently coupled to an o-alkoxyaniline fluorophore.
2] cryptand (4,7,13,16,21,24-hexaoxa1 1, 10-diaza-bicyclo[8.
The crown ethers and cryptand used in this study are shown in Fig.
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.
2004, Removal of Ag(I), Cu(II) and Zn(II) ions with a supported liquid membrane containing cryptands as carriers, Desalination 161, 295-303.
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.