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.

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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.

Evaluation of Diazatetraoxa Cryptand as Extractant for Transition Metals and Pb2+

sensor on this system consists of a macrocyclic ion-selective cryptand covalently coupled to an o-alkoxyaniline fluorophore.

Equimolar ammonia interference in potassium measurement on the Osmetech OPTI Critical Care Analyzer

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.

Crown ether-modified clays and their polystyrene nanocomposites

Syntheses centre on macrocyclic ligands of the crown ether or cryptand type and related complexing agents.

The Department of Chemistry at the University of Victoria

Polyaza macrobicyclic cryptands: synthesis, crystal structures of a cyclophane type macrobicyclic cryptand and of its dinuclear copper(I) cryptate, and anion binding features.

Binding and selectivity of halides with macrocyclic polyamines

2004, Removal of Ag(I), Cu(II) and Zn(II) ions with a supported liquid membrane containing cryptands as carriers, Desalination 161, 295-303.

Factorial experimental design for adsorption silver ions from water onto montmorillonite

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.

Macrocycles; construction, chemistry, and nanotechnology 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.

Crystalline Molecular Complexes and Compounds: Structures and Principles, 2 vols

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].

Determination of Stability Constants of Triazole Ligand Carrying Naphthol Group with Heavy Metal Ions in Aqueous Solutions

Polyammonium cryptands are bicyclic compounds, which are suitable for encapsulating anion in the cavity center.