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 66 for “"Dioxygen"”.
-
Dioxygen Electroreduction on Electrode Surfaces
Finally, thiocyanate (SCN) adsorption on Au electrode is examined. Both the calculations and the spectroscopy show that three different geometries are adopted by SCN in the potential region studied (0.0 V ≤ E ≤ 1.2 V vs. NHE). At low potential both N-bound and S-bound forms are found, at …
-
Electrocatalytic dioxygen reduction with copper complexes
… CuTPA reacts with dioxygen to form an end-on peroxo complex, while Cu2bistripic forms a side-on peroxo complex. It is found that both complexes likely react to form Cu2O2 complexes, with CuTPA exhibiting lower overpotentials for the ORR than Cu2bistripic. The low …
-
Electrocatalysis: dioxygen reduction and carbon dioxide conversion
U of I Only Restriction Lifted for Item 91480 on 2018-03-09T10:15:25Z.
-
Analysis of Carbon-Monoxide and Dioxygen Binding to Myoglobin
Made available in DSpace on 2015-05-13T15:21:55Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7606689.PDF: 1889469 bytes, checksum: 3a1efe03abd64a0469a6cb9aeecca8d9 (MD5) Previous issue date: 1975
-
Electrocatalysts for the reduction of dioxygen and carbon dioxide
The oxygen reduction reaction (ORR) plays a critical role at the cathode of most fuel cells. Due to the slow kinetics of the ORR, research has focused primarily on generating electrocatalysts with improved activity and economic viability. Building on the prior ORR success of a carbon-supported …
-
Capture and Characterization of Dioxygen Reactive Intermediates in CYP51 Catalysis
… This study aimed to trap and characterize dioxygen reactive intermediates, and elucidate the role of the unique acid-alcohol pair in the formation and stabilization of these intermediates. This study demonstrates our success in generating, stabilizing, and spectroscopically characterizing …
-
A Reduced Oxy Intermediate of Cytochrome P450(cam) Involved in Dioxygen Activation
… involved in hydrocarbon hydroxylation and dioxygen activation have been precluded by the reduction of the oxy intermediate being the rate determining step. D251N cytochrome P450$\sb{\rm cam}$ slowed the overall catalytic rate, while maintaining full catalytic coupling, while exhibiting a …
-
Auxiliary proton-influenced metal-mediated reactions: dioxygen activation, anion coordination, and catalysis
… and acid. The reactivity with dioxygen requires the hydroxyl substituent: neither [Cu(tripic)(NCMe)]+ nor the methoxy complexes display O2 reactivity. A similar mixed valence dimer was found to form upon exposing the dicopper(I) complex of a tetrahydroxy bis(tridentate) ligand …
-
Model complexes for active sites of diiron metalloproteins, dioxygen reactivity and water effects
(cont.) tetrairon(II) cubane complex was identified and structurally characterized. Chapter 4: Synthesis and Characterization of [Fe₂...CR)]³⁺ and [Fe₂...CR)]³⁺ Complexes with Carboxylate-Rich Metal Coordination Environment as Models for Diiron Centers in Oxygen-Dependent Non-Heme Enzymes. …
-
Preparation and characterization of pentadentate Schiff base cobalt(II) complexes and their dioxygen adducts
… have been prepared and their reaction with dioxygen studied. The ligands were synthesized from salicylaldehyde and diamino compounds containing a central donor atom. Various derivatives were produced by using a substituted salicylaldehyde or by placing different groups on the compounds …
-
Bio-inspired iron complexes featuring secondary coordination sphere interactions: Ligand design strategies and dioxygen reactivity
The activation of dioxygen plays an important role in processes ranging from biological oxidation to energy storage and utilization. In Nature, metalloenzymes use complex architectures to promote these multi-electron and multi-proton reactions using first-row transition metal centers. Many enzymes …
-
Dioxygen activation and substrate hydroxylation by the hydroxylase component of toluene/O-xylene monooxygenase from pseudomonas sporium OX1
… bacterial multicomponent monooxygenases activate dioxygen at structurally homologous active sites. Catalysis requires the management of four substrates: electrons, protons, dioxygen, and hydrocarbons. Protein component complexes control the delivery of these substrates to the diiron center in the …
-
Advances in non-heme diiron modeling chemistry : developing functional protein mimics through ligand design and understanding dioxygen activation
… Complexes 1 and 2 both react rapidly with dioxygen. Oxygenation of 1 afforded a ([mu]-hydroxo)diiron(III) complex [Fe2([mu]- OH)(PIM)(Ph3CCO2)3] (4), a hexa([mu]-hydroxo)tetrairon(III) complex [Fe4([mu]- OH)6(PIM)2(Ph3CCO2)2] (5), and an unidentified iron(III) species. Oxygenation of 2 …
-
Understanding orchestrated chemical reactions in toluene/o-xylene monooxygenase from pseudomonas sporium OX1
… a carboxylate-bridged non-heme diiron motif for dioxygen activation. Despite their conserved diiron active site structures and mechanisms of dioxygen activation, they catalyze a wide range of chemical transformations. These observations suggest that diiron-containing enzymes have distinct active …
-
The reaction of bis(thioether) complexes of (octaethylporphyrinato)ruthenium(II) with dioxygen, and the catalyzed O₂-oxidation of thioethers
This thesis describes a detailed study of the reactivity of Ru(OEP)(RR'S)₂ complexes (where OEP ≋ the dianion of 2,3,7,8,12,13,17,18-octaethylporphyrin, R ≋ methyl, ethyl or decyl, and R' ≋ methyl or ethyl) with 0₂, in various solvents. Exposure to O₂ (or air) of a benzene, toluene or methylene …
-
Use of sterically hindered carboxylate ligands to model structural and functional features of dioxygen-activating centers in non-heme diiron enzymes
Chapter I. Modeling Dioxygen-Activating Centers in Non-Heme Diiron Enzymes: Carboxylate Shifts in Diiron(II) Complexes Supported by Sterically Hindered Carboxylate Ligands General synthetic routes are described for a series of diiron(II) complexes supported by sterically demanding carboxylate …
-
Mechanistic studies of electron transfer, complex formation, C-H bond activation, and product binding in soluble methane monooxygenase
… 1. Soluble Methane Monooxygenase: Activation of Dioxygen and Methane The mechanisms by which soluble methane monooxygenase uses dioxygen to convert methane selectively to methanol have come into sharp focus. Diverse techniques have clarified subtle details about each step in the reaction, from …
-
Investigations concerning the reactions of small molecules with a series of pentacoordinate manganese complexes and the characterization of a solvent refined coal
… prepared and characterized. Their reactions with dioxygen and nitric oxide has been studied. The ligands were synthesized from substituted salicylaldehydes and selected hiamines containing a central nitrogen donor. The five-coordinate complexes assume a distorted trigonal bipyramidal structure. …
-
Reactions of dioxygen and nitric oxide with iron(II) compounds : models for chemistry occuring in the active sites of non-heme iron enzymes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
-
Exploring reactivity and component interactions in Toluene/o-Xylene Monooxygenase from pseudomonas sp. OX1
… of hydrocarbon substrates through activation of dioxygen. Each BMM utilizes a diiron active site housed within a catalytic hydroxylase protein. This diiron active site is responsible for activation of dioxygen and oxidation of hydrocarbons. Additional component proteins modify the structure of …
Page 1 of 4