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 14 of 14 for “"mixed-valent"”.
-
Synthesis, characterization, and anticancer activity of arene mono-ruthenium and heteroleptic mixed-valent diruthenium complexes
… paramagnetic bimetallic complexes. Due to their mixed valent Ru2(II, III) metalcore, cyclic voltammetry measurements were recorded to study the redox behaviour of the investigated complexes. The cytotoxic experiments performed against human breast MCF-7 and MDA-MB-231 cancer cells suggest that …
-
Cyanide-bridged polynuclear complexes
The three mixed valent dinuclear cyanide-bridged complexes LMCNFeCl3, (LM = Cp(dppe)Fe, Cp(dppe)Ru and Cp(PPh3)2Ru) were synthesized and characterized by X-ray single crystal determination, IR, UV-Vis and cyclic voltammograms, respectively. The three mixed valent dinuclear complexes display metal- …
-
Mixed-valence bimetallic dithiolates of iron, cobalt, and nickel and their relevance to the hydrogenases
… largely failed to replicate any of the extensive mixed-valent states of this active site. This thesis advances this area specifically through the synthesis and examination of mixed-valent bimetallic dithiolate complexes. Chapter 2 focuses on the NiRu dithiolate compound …
-
Electrochemical Deactivation of Nitrate, Arsenate, and Trichloroethylene
… and trichloroethylene inactivation on zerovalent iron (ZVI), mixed-valent iron oxides, and boron doped diamond film electrode surfaces, respectively. Nitrate ( ) is a common co-contaminant at sites remediated using permeable reactive barriers (PRBs). Therefore, understanding nitrate …
-
Bioinorganic hydrocarbon oxidation : mechanistic and kinetic studies of the soluble methane monooxygenase from Methylococcus capsulates (bath)
… -- Chapter 2. Small Molecule Binding to the Mixed-Valent Diiron Center of Methane Monooxygenase Hydroxylase from Methylococcus capsulatus (Bath) as Revealed by ENDOR Spectroscopy -- Chapter 3. An EPR Study of the Dinuclear Iron Site in the Soluble Methane Monooxygenase Reduced by One Electron …
-
I. An oxygen-17 NMR study on oxygen exchange in yttrium barium(2) copper(3) oxygen(7-x). II. Synthesis of transition metal polysulfide complexes from metal powders
… containing layered structures and mixed valent copper centers. Our studies on YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ focused on $\sp{17}$O-labelling of samples of $\rm YBa\sb2 Cu\sb3 O\sb{7-x}$ and the $\sp{17}$O NMR studies of these samples. The $\sp{17}$O-labelling process was carried …
-
Studies in Magnetism and Superconductivity under Extreme Pressure
… Eu metal the strong local-moment magnetism in divalent Eu: 4f<super>7</super>) suppresses superconductivity. Under sufficiently high pressure, Eu is expected to become trivalent and nonmagnetic: 4f<super>6</super>). Recently, superconductivity in Eu was discovered by Debessai <italic>et …
-
NMR characterization of a diiron macrocycle and structural characterization of a diketo derivative
… resemblance to the starting materials mixed valent species, [Fe<sub>2</sub>(TIED)(Cl)<sup>4</sup>]<sup>+1</sup> (TIED = tetraiminethylene dimacrocycles). Two isosbestic points were found at 538 and 371 nm.</p><p>The diketo-dimer's crystals appear to have individual colors, a physical …
-
Halogen-elimination photochemistry and oxygen-activation chemistry of late transition-metal complexes
… are disclosed. A new class of two-electron mixedvalent dirhodium and diiridium complexes is described. Featuring a coordinatively unsaturated M0 center, these complexes display an expansive reactivity with numerous small-molecule substrates. A dirhodium hydride complex, prepared by HCl …
-
Ligand field considerations for the reactivity of high valent metal-oxo complexes and of bimetallic HX splitting photocatalysts
… of low coordinate tris(alkoxide) complexes of divalent and trivalent metals were synthesized and characterized as single metal site models of oxidic metal clusters. Via oxygen atom transfer reactions, d⁰, d¹, and d² early transition metal-oxo complexes were stabilized. Analysis of structural …
-
Synthesis and analysis of low-valent NHC supported nickel complexes
… of (IDipp)Ni(OTf)(Et2O), a synthetic equivalent of (IDipp)Ni(I)+. Next, we show that the reaction of [(IDipp)Ni)]2(μ-ONp)(μ-OTf) with pentamethyldisiloxane results in isolation of {[(IDipp)Ni]2(μ-H)}[OTf]. Deprotonation of this hydride complex results in formation of [(IDipp)Ni]2, further …
-
Separation and Coordination Chemistry of Actinides
… interest are the structures containing mixed-valent U3O8 layers generated in situ in chapter II, and the structure containing a cation-cation interaction highlighted in chapter IV. Both of these topologies have unique aspects, the first in the method of generation, and the second for its …
-
Templating Metal Clusters via Resorcinarene- and Cyclen- Based Ligand Platforms
… this ligand platform, we isolate a family of divalent first-row dinuclear transition metal complexes—LCr2, LMn2, LFe2, LCo2, and LZn2. Crystallographic and DFT analysis reveals varying degree of metal-metal interactions from weak to strong quadrupole bonding. Lastly, in Chapter 5, LH4 is used as …
-
Mechanisms of Iron Oxidation in the Ferroxidase Centre of Escherichia coli Bacterioferritin: A Comparison to Other Ferritins
… discovered; the unprecedented observation of a mixed-valent ferroxidase centre forming in the cyanobacterial ferritin SynFtn directly upon reaction with O2 was incompatible with any reaction scheme currently published in the literature. This unprecedented reactivity was detected again in human …