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 20 of 31 for “"endohedral"”.
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Chromatography and purification of endohedral metallofullerenes
At the conception of this research, a separation methodology for obtaining purified mctallofullerene [A<sub>m</sub>@C<sub>2n</sub>, m = # of metal atoms, A, and C<sub>2n</sub> = # of carbons in the surrounding cage] samples was not yet developed. Isolation of these metal-encapsulated fullerenes was …
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Thermoionization and dissociation of fullerenes and endohedral fullerenes
… of energetically excited fullerenes and endohedral fullerenes are studied with mass spectrometry. Three experimental approaches have been developed for these studies. These are UV laser excitation time-of-flight mass spectrometry (TOF-MS), laser desorption and ionization mass spectrometry …
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Preparation, Separation, Characterization and Hydrogenation of Endohedral Metallofullerenes
Endohedral metallofullerenes (EMFs) have attracted increasing attention during past decades due to their novel structures and potential applications in a variety of fields such as biomedical applications and molecular electronics. This dissertation addresses the structural characterization and …
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Chemical Reactivity and Regioselectivity of Trimetallic Nitride Endohedral Metallofullerenes
Endohedral metallofullerenes (EMF) have attracted increasing attention during past decades for their potential applications in the fields of biomedicine and nanomaterials. Trimetallic nitride template endohedral metallofullerenes (TNT EMFs) are some of the most promising fullerene-based materials …
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Photoionization and Photofragmentation of the Endohedral Xe@C60+ Molecular Ion
… and fragmentation of the Xe@C60 + endohedral molecular ion is presented in the photon energy range of the well-known Xe 4d giant resonance, and evidence of redistribution of the Xe 4d oscillator strength in photon energy due to multipath interference is reported. Experiments were …
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Photoionization of the Cerium Isonuclear Sequence and Cerium Endohedral Fullerene
… photofragmentation cross sections of the cerium endohedral ion Ce$@$C$_{82}^{+}$ were also measured and studied in the 4d excitation-ionization energy range of cerium.Relative and absolute cross-section measurements were performed at undulator beamline 10.0.1 of the Advanced Light Source (ALS) …
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Nuclear Wavefunctions of Dispersion Bound Systems: Endohedral Eigenstates of Endofullerenes
Endohedral fullerenes, or endofullerenes, are supramolecular complexes where a small chemical species, A, is trapped within a cavity encompassed by a fullerene cage, Cn, denoted as A@Cn. Recent advances in the synthesis and characterisation of these species has produced a wealth of experimental …
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Computational Study of the Properties and Stabilities of Endohedral Metallofullerenes
… related to recently discovered or studied endohedral metallofullerenes (EMF) and a theory as to the selective stability of certain isomers of EMFs. Computational treatments of the anions of C80 and C94 are presented and compared in an effort to gain an understanding and predictive model for …
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Exohedral Functionalization and Applications of the Trimetallic Nitride Endohedral Metallofullerenes
… of the Sc₃N@C₈₀ and Sc₃N@C₇₈ trimetallic nitride endohedral metallofullerenes. In addition, this dissertation discusses miscellaneous research that is relevant to the aformentioned metallofullerenes and their applications, such as the discovery of a new cage isomer <i>(D<sub>5h</sub>)</i> of …
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Gadolinium Endohedral Metallofullerenes for Future Magnetic Resonance Imaging Contrast Agents
Gadolinium endohedral metallofullerenes (EMFs) have shown the potential to become next generation magnetic resonance imaging (MRI) contrast agents due to their significantly improved efficiency and safety, as well as multi-day body retention which allows for a longer surgery and observation …
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Yttrium, Gadolinium, and Lutetium Based Endohedral Metallofullerenes: From Synthesis to Application
Endohedral metalofullerenes (EMFs) have emerged as an important class of nanomaterials with vast promise in applications of molecular devices and nanomedicines. This dissertation addresses the EMF research span from synthesis to application, with an emphasis of work on trimetallic nitride template …
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Synthesis and Functionalizations of Trimetallic Nitride Template Endohedral Metallofullerenes (TNT-EMFs)
… of a new mix-metal trimetallic nitride template endohedral metallofullerene (TNT-EMF) and the functionalizations of M3N@C80 (M = Sc, Gd, Ho) under the high-speed vibration milling (HSVM) condition. In addition, this thesis discusses the internal motion of the cluster, Sc3N inside three different …
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Novel preparation of endohedral metallofullerenes via laser vaporization of fullerene/metal pellets
… been the method of choice for the production of endohedral metallofullerenes (Am@C2n). However, yields of endohedral metallofullerenes have been limited to only a few percent of the total fullerene yield, making the production and isolation of macroscopic quantities (grams) difficult. In the …
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Synthesis, Isolation, and Characterization of Tb-based Large Cage TNT-EMFs and Dimetallic Endohedral Metalloazafullerenes
… (40 ≤ n ≤ 44), and a family of novel dimetallic endohedral metalloazafullerenes with the molecular formula of M₂@C₇₉N (M=Y, Tb, and La), were for the first time systematically synthesized, isolated, and structurally characterized. The protocol developed in this thesis provides an effective and …
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Muonium in C₆₀ fullerites : studies of structural and electronic properties
… bonded muonium radical, while the other is endohedral muonium with a hyperfine parameter Aμ, close to that of muonium in vacuum. The signal from the muonium-C₆₀ radical -- which is characterized by a small Aμ, (10% of Avacμ) and an anisotropic hyperfine interaction -- is sensitive to the …
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Synthesis and spectroscopy studies of fullerenes and discovery of macroscopic quantities of doped fullerenes
… at 1200$\sp\circ$C. Many properties of these endohedral complexes were investigated in detail. Similar results were obtained with yttrium-doped fullerenes, and double-doped endohedral fullerene complexes were first observed as a stable species in both sublimed film and toluene solution. …
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Supramolecular approaches to cryorelaxors for biological NMR studies
… rotationally labile methyl groups, and endohedral fullerene complexes.<br/>The first chapter provides an overview of the background of the project and of potential approaches to the problem of low temperature relaxation agents, particularly those based on supramolecular systems. The next …
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Dual Spin-Cast Thermally Interdiffused Polymeric Photovoltaic Devices
… conditions. Trimetallic Nitride Tempelated (TNT) endohedral fullerenes are also examined in this thesis as the novel acceptor materials. Bulk heterojunction or blend devices are fabricated with P3HT as the donor material and several TNT endohedral fullerenes as the acceptor material. Y3N@C₈₀PCBH …
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Part I. Cytochrome c oxidase active-site modeling: Synthesis and characterization of new unsymmetrical tris(imidazole- and pyridine-appended) picket-fence porphyrins and their metal complexes. Part II. Toward fullerene-based radiopharmaceuticals: High-yield neutron activation of endohedral holmium-165 metallofullerenes
… chelation conformation to be assumed. Part II . Endohedral holmium metallofullerenes, 165 Ho x @C 82/84 (x = 1,2), have been prepared by carbon-arc methods and separated from empty fullerenes by HPLC techniques. The 165 Ho metallofullerenes and empty C 60 were then bombarded with neutrons under …
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Effects of Thickness, Morphology and Molecular Structure of Donor and Acceptor Layers in Thermally Interdiffused Polymer Photovoltaics
… treatments on these devices is described. The endohedral fullerene Sc₃N@C₈₀ is introduced as a new acceptor material. The endohedral fullerene consists of Sc₃N cluster enclosed in a C₈₀ cage. An order of magnitude increase is seen in device performance upon sublimation of these molecules on a …
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