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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 548 for “"anions"”.
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Dipyrromethane based receptors for anions
… based receptors and their ability to bind anions, in particular carboxylates of amino acid derivatives.<br/>Chapter I provides a general introduction to the field of Supramolecular Chemistry and its applications. In this chapter a series of receptors for anions are presented their …
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Binding anions using simple neutral molecules
… to have high affinities for a variety of oxo-anions in highly competitive DMSO solutions. Of these receptors, the diindolylurea motif was found to be excellent for the binding of dihydrogen phosphate. This group of receptors were found to form 1:1 complexes in solution with various anions but …
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Calixarene and coordination complex hosts for anions.
… interested how the host ligand binds with metal anions in solution and solid state chemistry. We synthesised simple pyridyl urea ligands and isomorphs. Their anion binding studies are discussed in terms of solid state and solution chemistry. Solid state structures based on silver and copper metal …
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The structure and reactivity of enolate anions.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1965. Ph.D.
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Radical anion rearrangements. aryl cyclopropyl ketyl anions
… generated aryl cyclopropyl] ketyl anions, we have shown that the assumptions made in the use of these substrates as SET probes are not necessarily valid. Using derivative cyclic and linear sweep voltammetry it was discovered that the ketyl anions of alkyl- and unsubstituted aryl …
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Dipole moment effects in photodetachment from cluster anions
… major advantage of using solvated atomic iodide anions: I<super>−</super>·(Y)<sub><italic>n</italic></sub>: Y = solvent molecule, <italic>n</italic>=1 to 3)) to study this effect is that in the ground state, the excess electron is mainly localized on the iodine atom for which …
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Recognition of Cations and Anions by Lanthanide Complexes
Transition metal cations and oxoanions are involved in many biological and environmental processes. Biologically, these ions have roles in aging and in the pathogenesis of a wide variety of disorders including neurodegenerative diseases such as Alzheimer’s and Parkinson’s, inflammation, reperfusion …
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The design of synthetic transmembrane carriers for anions
… to facilitate the transmembrane transport of anions in synthetic vesicle systems. A series of structurally simple thioureas were found to function as efficient Cl-/NO3- and Cl-/HCO3- antiporters while the corresponding ureas were inactive. Of these receptors, a simple indolylthiourea was found …
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Binding and Detection of Anions Using Tripodal Hosts
The aim of this project was to investigate the anion-binding properties of a range of different receptor compounds. For the most part, the receptors reported here were tripodal in nature, wherein three hydrogen-bonding receptor groups, including amines, amides and ureas, are linked around a common …
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Rearrangements of Radical Anions Generated from Cyclopropyl Ketones
Cyclopropyl-containing substrates have been frequently utilized as "probes" for the detection of SET pathways in organic and biorganic systems. These reactions are based on the cyclorpropylcarbinyl → homoallyl rearrangement, which is fast and essentially irreversible. The implicit assumption in …
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Photoelectron Imaging of Iodide Centered Alkyl Halide Cluster Anions
… The insights developed from the I−·CH3X cluster anions are applied to I−·C2H5X: X = I, Br, Cl) and I−·CH2X2: X = I, Br, Cl) detachment. The experimental cluster anion photoelectron angular distribution trends deviate somewhat from the ab initio calculations and experimental electron scattering …
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Chemical and electrochemical studies of Borane Anions and Metallaboranes
… have been prepared. The disubstituted anions [B₃H₆(Cl)(X)]⁻(X = NCBH₂NCBH₃, NCBH₂CN and NCB₃H₇) and [B₃H₆(Br) NCB₃H₆(Br)]/⁻ have also been prepared and studied by various spectroscopic techniques. Two-dimensional n. m. r. spectroscopy was shown to be useful in the qualitative …
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DEVELOPMENT OF NOVEL SENSORS FOR ANIONS OF ENVIRONMENTAL INTEREST
… pH range (2-12) and a selection of interfering anions (F', CI", B r , T, SCN, CIO4", HCO3", NO2", S04^ phthalate) were studied. A field evaluation by continuous immersion in both agricultural drainage weirs and a river were undertaken. The nitrate results obtained with the ISEs compared very …
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Electron Transfer and Other Reactions Using Atomic Metal Anions
The atomic metal anions Rb-, Cs-, Cu-, Ag- and Fe- have been generated in the gas phase and reacted with various neutral reactants in a triple quadrupole mass spectrometer. The metal anions were formed via electrospray ionization of the metal-oxalate solutions and form in gas phase between the …
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Block and Graft Copolymers Containing Carboxylate or Phosphonate Anions
… copolymers containing carboxylate or phosphonate anions that are potential candidates for biomedical applications such as drug delivery and dental adhesives. Ammonium bisdiethylphosphonate (meth)acrylate and acrylamide phosphonate monomers were synthesized based on aza-Michael addition reactions. …
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The chemistry of mono and multiple anions of methylheteroaromatics
… in dimethoxyethane (DME). The use of multiple anions of methylheteroaromatics was also investigated in several model systems. These methods offer a convenient means of drug design in a variety of different heterocycles of medicinal importance.
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Using Major Anions and Cations to Describe Trans-Pecos Springs
No abstract prepared.
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Recherche de nouvelles phases mobiles pour la chromatographie des anions
… été alors exploité davantage pour l'analyse des anions d'intérêt. Les paramètres expérimentaux optimisés pour cette phase mobile comprennent la longueur d'onde du détecteur à laquelle la phase mobile absorbe le mieux, la concentration maximale, le pH convenable de la phase mobile et enfin le …
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Molecular and Functional Analyses of Transport Proteins for Organic Anions
… comparative experiments with model organic anions in isolated proximal kidney tubules of killfish and CP of rat and spiny dogfish shark. ·First, I studied transport of the fluorescent cAMP analog fluo-cAMP. Inhibition studies indicate transport mediated by the export proteins Mrp2 and Mrp4. …
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