Global ETD Search
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 11 of 11 for “"Alkali metal ions"”.
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Molecule recognition of nucleic acids, nucleosides, nucleotides, and their derivatives
… due to the evolving repair of such DNA lesions in malignant cells. Therefore, development of pharmaceutical agents, which can interfere with the DNA repair pathways, may represent a novel approach to enhance the cytotoxic effects of chemotherapy by reducing drug resistance. Abasic sites (AP …
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Infrared spectroscopy of ion-hydrocarbon clusters
… is the balance between these competing interactions which governs their chemistry. This Thesis aims at exploring ion•••hydrocarbon interactions, then ion•••water•••alkane interactions. To accomplish this, a combination of gas phase infrared predissociation spectroscopy (IRPD) and tandem mass …
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Synthesis and cation binding properties of bis-bridged calix[6]arenes
… calix[6]arenes have been synthesized and their metal binding properties and structural conformations were studied in solid, solution, and gas phase. Methods of testing include: NMR titrations, liquid-liquid extractions, x-ray crystallography, and electrospray ionization-MS. A dialkylated …
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Synthesis and host-guest interaction of cage-annulated podands, crown ethers, cryptands, cavitands and non-cage-annulated cryptands.
… spacer were synthesized. Comparison of their metal ion complexation behavior as revealed by the results of electrospray ionization mass spectrometry (ESI-MS), alkali metal picrate extraction, and pseudohydroxide extraction with those displayed by the corresponding hosts that contain …
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Investigation of triphenylene-based radical-containing ligand bridges in mediating electronic spin coupling and sensing chemical analytes
… spin exchange coupling between paramagnetic metals, and have potential for maintaining coherence at room temperature. In this thesis, the author explores ligand-mediated spin coupling and quantum properties of the tritopic radical bridge HXTP (HXTP = 2,3,6,7,10,11-hexa-substituted …
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Characterization of Cucurbituril Complex Ions in the Gas Phase Using Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
<p>Host-guest interactions have been well studied in the new century to obtain fundamental insights into supramolecular chemistry. Most of the pioneering works have been done using techniques such as NMR, X-ray crystallography, IR spectroscopy and so on. However, none of these techniques is …
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Physical, electrical and electrochemical characterizations of transition metal compounds for electrochemical energy storage
… In this dissertation we report four transition metal materials systems with potential applications in electrochemical energy storage. Nanoscale and nanostructured materials are expected to play important roles in energy storage devices because of their enhanced and sometimes unique physical and …
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Kinetics of alkali metal ion self-exchange on polystyrene sulfonate resin in dimethyl sulfoxide-water media
<p>Rates of alkali metal cation self-diffusion in a polystyrene sulfonate ion exchange resin and in the external solution have been measured over a range of dimethyl sulfoxide (DMSO)-water mixtures from 0 to 70 mole % DMSO. Interpretation of results is simplified by the choice of this system which …
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Electrochemical synthesis of polyesters and polyamides. A study of the polymerisation of lactams, lactones and the anhydride/propylene oxide system by direct electrolysis of their conducting solutions
… acetonitrile and tetrahydrofuran (THF) using alkali metal salts or quaternary ammonium salts as supporting electrolytes. Electrolysis were performed in the single and divided cell under an atmosphere of purified nitrogen. Polymerisation of propylene oxide/phthalic anhydride occurred in both …
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Morphological Characterization and Analysis of Ion-Containing Polymers Using Small Angle X-ray Scattering
… morphology of Nafion 117CS containing different alkali metal ions in solid state. Contrast variation allows one to manipulate scattering data to obtain desired morphological information. At room temperature, only the crystalline peak was found for Na⁺-form Nafion, while for Cs⁺-form Nafion only …
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Charge and temperature effects on biomolecule hydration: an experimental and computational investigation
… temperature on the structure of hydrated cluster ions. This is investigated using a combination of infrared photodissociation (IRPD) spectra and geometry and frequency calculations. The particular cluster ions examined here include hydrated rubidium cluster ions and hydrated sodium- and …