CROWN ETHER
Removal of Mineral Salts by Heteropoly Acid-Crown ether Adduct for Quick Determination of Trace Amounts of Lithium in Natural Brines
... of crown ether derivatives depends upon the relative size of ions, hole of the crown ether r ing, number and var iety of heteroatoms, the geometry of crown ether, ...
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Assembled Nanoparticle Films with Crown Ether Derivatives as Sensors for Metal Ions
... It is hypothesized that these networked films of CE-MPCs should respond to metal ions in solution as they would in solution. Our CE-MPCs films were assembled using sodium ion as the coordinated metal in the crown ...
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Computational Evaluation of N,N-Dimethylaminophenyl Methyl Ether and Crown Ether for Metal Selective Sensor Development
... The results in Tables 2 and 3 show the effective charge that resides on the metal ion after it is complexed into an aliphatic crown ether. In each case this charge on the complexed metal ion is ...
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Analysis of the Possibility of the Crown Ether Structure Modification by the Introduction of Chelate Fragment
... of crown ether, nitrogen- containing crown ethers, azacrown containing chelating groups and cyclopendante compounds are the most effective complexing ...the crown ring, the nature of donor ...
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Gas-phase microsolvation of ubiquitin: investigation of crown ether complexation sites using ion mobility-mass spectrometry.
... single crown ether. Binding of five crown ethers eventually results in the appearance of the compact state, but it never becomes ...the crown ether molecules take over the role of the ...
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Recognition of metal cations with surface immobilized crown ether functionalized poly(ferrocenylsilane)
... The second alternative procedure tried was a solvent free Friedel-Crafts acylation using ZnO as catalyst. Examples of acylation reactions performed by this procedure were promising as most reactions were completed within ...
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Spectral analysis and catalytic activity in the hydrolysis of the phosphate ester by aza crown ether cerium (III) complex
... An aza-crown ether ligand, 4,7,13,16-tetraethoxycarbonylmethyl-1,10-dioxa-4,7,13,16-tetraaza-18-C-6, was synthesized and characterized in this work. The binary complex containing cerium ion (III) and the ...
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Synthesis and Investigation of Polyimide-Based Proton-Exchange Membranes Containing Polysiloxane and Crown Ether Moiety
... In present work, a number of polyimides contained polysiloxane and crown-ether moiety in the main chain were synthesized. Solubility in organic solvents and film-forming ability were investigated. Prepared ...
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Extraction of Potassium (I) with mixed crown ether from weak acid medium and its applications
... Solvent Extraction.100 μg of Potassium(I) was mixed with picric acid in the concentration range of 0.00001M to 0.05M in a total volume of 10 mL. The solution was then transferred to a conical flask and was equilibrated ...
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Crown Ether complex Cation Like Ionic Liquids: Synthesis and Catalytic Applications in Organic Reaction
... the crown ether and inorganic/organic salts in methanol to generate the desired ...of crown ether and relevant salts in methanol at 60 o C, followed by evapouration and finally evacuated under ...
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Crown Ether Schiff bases and Their Complexes: Recent Advances Review
... Aza-Crown Ether Schiff base as Catalyst Zeng et ...aza-crown ether cycle and their transition elements ...in crown ether observed remarkably dioxygen affinities and biomimetic ...
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A potassium crown ether complex with dichloroaurate(I)
... of potassium ion encapsulated by the 18-membered crown ether 1,4,7,10,13,16-hexaoxacyclooctane and a linear dichloro- aurate(I) monoanion. The potassium occupies a crystal- lographic center of symmetry with ...
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Rare earth crown ether complexes: (15 crown 5)tris(nitrato)praseodymium(III)
... crown-5, that had been treated with carbon dioxide under re¯ux as part of a study of the chemical activation and reduction of carbon dioxide promoted by trivalent lanthanide ions. Analysis calculated for C 10 H 20 ...
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(18 Crown 6) bis(tetrahydrofuran)potassium iodide
... lengths to the axial THF ligands are shorter than those with the crown ether, and in the others they are approximately the same. Equatorial KÐO bond lengths range from 2.704 to 2.894 AÊ, with a mean of ...
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Smith_unc_0153D_18077.pdf
... In chapter 2, nickel catalysts supported by diethylamine- or aza-crown ether-containing aminophosphinite (NCOP) pincer ligands catalyze the insertion of benzaldehyde into a C−H bond of acetonitrile. Neutral ...
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A sandwich strand supramolecular complex: aquachloro(nitrilotriacetato κ2N,O)copper(II) 18 crown 6 ether trihydrate
... the crown ether molecules. No direct metal–crown ether bond exists in the infinite sandwich-type hydrogen-bonded ...The crown ether molecule lies on an inversion ...
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2 Aminomethyl 15 crown[5] hydrochloride dihydrate
... the crown ether; however, an extensive supra- molecular array is formed by means of numerous hydrogen bonds ...The crown ethers associate solely with each other, forming dimers linked by a ...
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Investigations on the influence of the coordination formation between dibenzo and benzo derivatives of 18-crown-6 and 15-crown-5 crown ethers with Pr (III) and Nd (III) ions in solution
... & crown ether complexes since they can be used for the lanthanoid ion separation, for stabilizing Ln (II) oxidation states and for studying high coordination numbers of the lanthanoid ...
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s-Block cooperative catalysis : alkali metal magnesiate-catalysed cyclisation of alkynols
... Summarising Table 1, it is clear that the organomagnesium compound used in this study is unable to catalytically promote cyclisation of alkynols. Homometallic alkali metal compounds can only poorly promote the reaction; ...
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Thesis
... the crown ether oxygens and iodine, using it as a fifth electron donor and stabilizing its cation-crown ...diethyl ether into a saturated DCM solution at -30 ...
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