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Showing 1 to 20 of 253 for “"Iridium."”.
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Sputter deposition of Iridium and Iridium Oxide for stimulation electrode coatings
… is excited by the activation of one electrode. Iridium and iridium oxide (Ir and IrOx) are used as thin film coatings of stimulation electrodes. Charge transfer is accomplished by means of redox reactions. The goal of the work was to determine and develop the processes and underlying effects …
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Studies of Iridium Carbonyl Cluster Complexes
… and transformed into five polynuclear iridium compounds, Ir<sub>2</sub>(CO)<sub>6</sub>(μ-GePh<sub>2</sub>)(GePh<sub>3</sub>)<sub>2</sub> (2), Ir<sub>3</sub>(CO)<sub>6</sub>(η1-Ph)<sub>2</sub>(μ-GePh<sub>2</sub>)<sub>3</sub>(GePh<sub>3</sub>) (3), …
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Thiocarbonyl and selenocarbonyl complexes of iridium
… this thesis concern synthesis and reactivity of iridium(I) and (III) complexes containing thiocarbonyl or selenocarbonyl ligands. Chapter 1 comprises: a review of Vaska's compound, IrCl(CO) (PPh3)2 and related species, covering syntheses, structure and bonding and reactions of this very widely …
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C-H activation: oxidative addition to an iridium(I) center and reactivity of the resulting iridium(III) species
Thermal reactions of the iridium complex, [Ir(COD)(PMe₃)₃]Cl (COD=1, 5 Cyclooctadiene), with benzene, benzaldehyde, pyridine, and furan yield the C-H addition products of mer-(Me₃P)₃Ir(Phenyl)(H)C! (1), mer-(Me₃P)₃Ir(COC₆H₅)(H)Cl (II), mer-(Me₃P)₃Ir(Pyridyl)(H)Cl (IID, and mer-(Me₃P)₃Ir(furyl)Cl …
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Iridium-Catalyzed Enantioselective Allylation of Alkenyl Boronates
… Additionally, select examples of iridium-catalyzed nucleophilic substitution reactions will be examined. The second chapter describes the reaction of alkenyl boronates with allylic carbonates to generate tertiary bis-homoallyl boronic esters with high enantioselectivity and …
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Asymmetric hydrogenation catalysed by platinum and iridium
… a 1: 1 interaction.It has been discovered that Iridium, especially when supported on calcium carbonate, is an effective catalyst for both racemic and enantioselective hydrogenation of methyl pyruvate. When Ir/CaCO³ was reduced and modified by cinchonidine, hydrogenation of methyl pyruvate at 273 …
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Developing and Understanding Iridium-Catalysed Arene Borylation
Iridium catalysed C-H borylation has moved from an interesting observation to an efficient catalytic reaction. This work has developed and improved upon some of the key issues associated with the methodology. The one-pot conversion of aryl boronates, generated by C-H borylation, to other …
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Mechanistic studies on iridium catalyzed allylic substitution
Mechanistic studies on iridium catalyzed allylic substitution reactions catalyzed by iridium phosphoramidite complexes revealed that the active catalyst is generated through a base assisted cyclometalation of the phosphoramidite to form five-membered iridacycle. A mechanism for the reaction was …
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Organo-iridium compounds: synthesis, characterization and reactivity
Today, few water-soluble organometallic compounds are known, and little research has been done in this area. Water-soluble organometallic complexes are of interest for two reactions. First, a water-soluble compound that could be developed as a catalyst eliminates the need for organic solvents and …
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O-H activation in phosphates: oxidative addition to an iridium(I) center and reactivity of the resulting iridium(III) species
… binding modes of the phosphate group to the iridium center and then to react biologically occurring phosphates with [Ir(1,5-COD)(PMe₃)₃]Cl. The reaction of dibenzyl phosphate (DBP) with [Ir(1,5-COD)(PMe₃)₃]Cl has been studied in detail. The resulting complex, Ir(PMe₃)₃(H)(DBP)Cl, is soluble …
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Epitaxial graphene and cluster lattices on Iridium(111)
The growth and the structure of epitaxial graphene on Ir(111) and its use as a template for metal cluster superlattices are treated. Experiments have mainly been carried out with STM and LEEM in UHV. Graphene was grown by two basic methods:(i) Temperature programmed growth (TPG), which is …
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The 'Indenyl Effect' in iridium(I) olefin complexes
"The complexes CpIr($\eta\sp2$-C$\sb8$H$\sb{14}$)CO and ($\eta\sp5$-C$\sb9$H$\sb7$)Ir($\eta\sp2$-C$\sb8$H$\sb{14}$)CO were prepared in high yield from (($\eta\sp2$-C$\sb8$H$\sb{14}$)$\sb2$Ir(CO)Cl) $\sb2$ and thallium cyclopentadienide or potassium indenide, respectively. The stereoisomers of …
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The marine geochemistry of rhenium, iridium and platinum
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institution, 1991.
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Nucleation and stacking faults on the Iridium (111) surface
By analyzing the saturation island density during nucleation in homoepitaxial growth on Ir(111) using scanning tunneling microscopy (STM), parameters of adatom diffusion could be determined. Furthermore, for the first time also the diffusion barrier for the dimer was determined by this method. …
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Strategies to Optimize Photophysical Properties in Cyclometalated Iridium Complexes
In the past 50 years, iridium has become an indispensable material that supports various technologies that power our modern world. Recently, there has been a growing interest in iridium(III) organometallic complexes for their optoelectronic applications. This thesis delves into the synthesis, …
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Ligand Cooperative Iridium PCP Complexes for Small Molecule Activation
… linkers. This ligand was installed onto an iridium center via double C-H activation at the central carbon atom, resulting in a carbene donor which can be used in favorable metal-ligand cooperative processes. This design feature was used for the activation of N2O, where a series of …
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Copper Electrodeposition on Iridium, Ruthenium and Its Conductive Oxide Substrate
… of copper deposition on the polycrystalline iridium, ruthenium and its conductive oxide. The electrochemical methods cyclic voltammetry (CV) and chronocoulometry were used to study the under potential deposition. The electrochemical methods to oxidize the ruthenium metal are presented, and …
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A study of the oxygen electrochemistry of ruthenium and iridium
… of the anodic behaviour of ruthenium and iridium in aqueous solution and particularly of oxygen evolution on these metals. The latter process is of major interest in the large-scale production of hydrogen gas by the electrolysis of water. The presence of low levels of ruthenium trichloride …
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