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.
Results
Showing 1 to 20 of 224 for “"Oxidation state"”.
-
Investigation of uranium oxide of low oxidation state
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1957.
-
High oxidation state organometallics and their charge transfer materials
… components in the molecular synthesis of solid state materials displaying cooperative electronic interactions. Complexes of the type CpVX$\sb3$ (Cp = $\eta\sp5$-C$\rm\sb5$H$\sb5$ or -$\rm C\sb5H\sb4$Me; X = Cl, Br) are highly oxidizing. The oxidation potential can be tuned by changes in the …
-
Cyclopropene polymerization and enyne metathesis catalyzed by high oxidation state molybdenum alkylidenes
… (4). The solid state structure of 3 revealed a "syn/syn" bimetallic species related to lb. In solution two resonances can be observed in the alkylidene region of the 1H NMR spectra for the "syn/anti" isomer of la, Ib, 2, 3, 4 and 5. The total amount of the …
-
The nature and role of oxidation state dependent conformational differences in cytochrome c
… role of conformational differences between the oxidation states of cytochrome c. Using x-ray crystallographic techniques, the oxidized form of yeast iso-l-cytochrome c was solved and compared to the previously determined reduced state. The following differences between the oxidation states were …
-
Methionine: oxidation state in processed foods and enzyme-catalyzed reaction with adenosine triphosphate
… total methionine, determined by performic acid oxidation, recovered as methionine, methionine sulfoxide, and methionine sulfone after hydrolysis with 2M NaOH were, respectively 101, 0, and 0% in lysozyme, 68, 25, and 0% in oxidized lysozyme, 74, 3, and 0% in casein and 0, 74, and 0% in oxidized …
-
Change Of Metal Oxidation State At High Temperature, Impact Of Temperature And Reactive Gases
… activity changes as the result of changes in oxidation state due to high temperatures in the presence of oxygen, decomposition of N2O over an Ir/Al2O3 catalyst was selected. During the reaction O2 and N2 chemical products are produced, whereby the oxygen product can further react with iridium …
-
Pesticide Adsorption and Degradation Properties as Influenced by Iron Oxidation State in Clay Minerals
Reduction of structural Fe in the clay greatly increased the adsorption and produced substantial degradation of all pesticides. When reacted with chemically treated clays, the total amount of atrazine removed from solution by the reduced clay was much greater than by the oxidized or reoxidized …
-
High Oxidation State Organometallic Chemistry: The Synthesis and Reactivity of nitridoruthenium(VI) Alkyl Complexes
The reaction chemistry of anionic nitridoruthenium(VI) alkyl complexes has been studied. Reactions at the nitrido nitrogen as well as the ruthenium center have been used to synthesize several new ruthenium(VI) complexes. As with nitridoosmium(VI) alkyl complexes, the nitrido ligand was found to …
-
High oxidation state metal centers as sites for nitrogen fixation and reduction to ammonia
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1992
-
High-oxidation-state molybdenum and tungsten monoalkoxide pyrrolide alkylidenes as catalysts for olefin metathesis
… of alkylidene isomerism and catalyst resting state are examined. Chapter 4 contains synthetic and catalytic studies of thiolate-containing Mo and W imido alkylidene complexes. The species M(NAr)(CHCMe 2Ph)(pyr)(SHMT) (M = Mo or W), Mo(NAr)(CHCMe₂Ph)(Me₂pyr)(STPP), and Mo(NAr)(CHCMe₂Ph)(STPP)₂ …
-
Z-selective olefin metathesis processes and Cis/syndioselective ROMP with high oxidation state molybdenum alkylidenes
… insoluble in common organic solvents. Solid state CPMAS 13C NMR spectroscopy revealed insoluble polyNBDF6 to be highly tactic, and the tacticity is proposed to be syndiotactic. Cis, tactic polymer was prepared through the addition of 3,3-methylphenylcyclopropene (MPCP) to molybdenum MAP …
-
Synthesis and reactivity of high oxidation state molybdenum catalysts for ring opening metathesis polymerization of olefins
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1991.
-
Understanding the Role of Ligand Oxidation State: Design, Synthesis, and Reactivity of Electronically Asymmetric Molybdenum Dithiolene Complexes
… We are hypothesizing that by altering the oxidation states of the dithiolene, the reactivity of the cofactor can be tuned for different substrates. This investigation focuses on the synthesis and characterization of oxo-MoIV(dithiolene) complexes that possess a fully reduced dithiolene …
-
High oxidation state organometallic and coordination chemistry: The synthesis and reactivity of nitridoosmium(VI) thiolates and alkoxides
Transition metal-thioaldehyde complexes were reviewed in Chapter 1. A series of organoosmium(VI) thiolate complexes, (Os(N)$\rm(CH\sb2SiMe\sb3)\sb2(\mu$-SR) $\sb2$ (R = Et, CMe$\sb3,$ CHMe$\sb2,$ CH$\sb2$CHMe$\sb2,$ CH$\sb2$Ph), and the tetraalkoxide and tetrathiolate complexes $\rm\lbrack …
-
Synthesis and reactivity of high oxidation state tungsten and molybdenum olefin metathesis catalysts bearing new imido ligands
Chapter 1 details the synthesis of tungsten imidoalkylidene compounds bearing strongly electron-withdrawing imido ligands. An alternative synthesis involving the treatment of WCl6 with 4 equivalents of N-trimethylsilyl-substituted anilines and subsequent workup with 1,2-dimethoxyethane (DME) has …
-
Effects of structural iron oxidation state on the hydraulic conductivity and potassium fixation of smectite clays and soils
Restricted to the U of I community indefinitely during batch ingest of legacy ETDs
-
High oxidation state molybdenum and tungsten imido alkylidene and metallacycle chemistry : catalytic asymmetric olefin metathesis and mechanistic investigation
… of ethylene in solution. The resting state of the catalytic cycle, unsubstituted molybdacyclobutane 70, slowly decomposed to yield propylene. This observation suggests that β-hydride elimination can compete with bimolecular coupling of methylene complexes under some conditions. Chapter …
-
The Effects of Iron Oxidation State on Surface Chemistry and Structure of Iron-Bearing Smectites: Cation Fixation and Selectivity, Structural Iron Environment, and Dissolution
… this study was to investigate the effects of the oxidation state of structural Fe on cation fixation and selectivity and smectite structure. Experimental results revealed that reductive K fixation in smectite suspension occurs under the condition that K was present in the interlayer prior to or …
-
Oxygen as a Mass Transport Probe in Polymer Films (Chronocoulometry, Hydrodynamic)
… behavior within such films primarily in a chosen oxidation state. For the system investigated, oxygen diffusion occurs either rapidly or within polymer-enclosed solvent pools and does not reflect viscosity changes in the polymer phase with oxidation state.
Page 1 of 12