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 60 for “"metal coordination"”.
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Hydrophosphination of Vinylcyclopropane & Quinine for Metal Coordination Chemistry
… iridium, rhodium, copper, and silver to produce metal complexes. Comprehensive characterization of the synthesized phosphines, phosphine chalcogenides, and metal complexes was performed using infrared (IR), ultraviolet-visible (UV-Vis), multi-nuclear spectroscopy, and high-resolution mass …
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Electronic response of phosphorus and nitrogen based ligands on metal coordination
… ligands were examined in terms of their coordination flexibility. Combining these donor atoms of different hardness or softness in one molecule leads to the design of polyfunctional, ambidentate ligand systems with unique properties, because the different features associated with each …
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Thermodynamic and activation parameters of redox reactions of transition metal coordination compounds
Contains fulltext : mmubn000001_027597504.pdf (Publisher’s version ) (Open Access)
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Probing Base Metal Coordination Complexes Using Electrospray Ionization Quadrupole Time-of-Flight Mass Spectrometry
… much research has been completed focusing on metal coordination complexes in the liquid phase but very little in terms of the gas phase. The purpose of this research is to further investigate these conditions and learn more about the reactions that can occur using Electrospray Ionization …
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Improved Synthesis, Separation, Transition Metal Coordination and Reaction Chemistry of a New Binucleating Tetraphosphine Ligand
… cleavage reactions catalyzed by late transition metal complexes. Previously reported results are summarized here. Mechanistic aspects of alkene hydration catalyzed by late transition metal complexes are also explained. The second part of Chapter 1 focuses on motivation for using bimetallic nickel …
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Ultrafast photophysics of transition metal coordination complexes studied with femtosecond extreme ultraviolet transient absorption spectroscopy
Ultrafast femtosecond dynamics of various simple metalloporphryinates (M = Fe3+, Ni2+, Mn3+, Co2+) and a heterobimetallic complex CoMnCl(py3tren) are studied using a homebuilt extreme ultraviolet (XUV) transient absorption apparatus. XUV photons are produced via high-harmonic generation, allowing …
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The design and synthesis of new transition metal coordination complexes as potential anti-malarial agents
New Rh(I), Rh(III), Ir(III) and Pd(II) coordination complexes bearing 1,10-phenanthroline (phen) or 2,2'-bipyridyl (bipy) ligands have been investigated for potential anti-malarial activity.
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Two New Resorcinarenes: A Pyridine & Acetic Acid Ligand for Metal Coordination and a Deep-Cavity Nitroquinoxaline Resorcinarene
… moieties as ligands for a variety of transition metal ions further increases the versatility of this class of host compounds. A new resorcinarene-based molecule functionalized with four pyridine and acetic acid ligands has been successfully prepared to explore the properties of metal-assembled …
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Modulation of Metal Coordination and Redox Properties of the Engineered Purple copper(A) and Ferrocene Centers in Azurin
Finally, the temperature effect on the pH of biological buffers was studied. Colorimetric determination of apparent pH using indicator dyes revealed significant changes in the apparent pH of buffer solutions at cryotemperatures.
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Platinum group metal coordination complexes of ferrocenyl N-donor ligands and their potential application in catalysis and medicinal chemistry
In this project a series of multinuclear complexes were successfully prepared and characterised using an array of analytical techniques. The use of nitrogen-donor ligands, in particular pyridine and ferrocenyl derivatives thereof was examined. Two main approaches were taken in the preparation of …
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Mechanochemical Understanding of Metal-Coordinated Polymers Using Simulation and Experiment
Metal-coordination bonds have the capacity to reform after rupture, thereby enabling dynamic, tunable, and reversible (self-healing) mechanical properties. Several biological organisms, such as marine mussels (Mytilus) and marine worm jaws (Nereis virens), have been found to take advantage of these …
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The behavior of Fe3+ coordination in alginate-catechol networks
… hardness of the byssus coating. Inspired by the metal-coordination chemistry found in byssus coating, scientists have synthesized an array of self-healing hydrogels with catechol-modified, 4-branched PEG (4cPEG) and various metal ions, primarily Fe3+. While considerable testing has been conducted …
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Mutable mechanics in biomaterials : a study of trichocyte keratin and Nvjp-1 protein
Disulfide bonds and metal-coordination bonds serve as flexible connections on account of their variable bond strengths in different chemical environments. Both bonds can act as an effective switch to stabilize or weaken a protein's geometry. These mechanisms are responsible for protein mutability, …
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Isotopic labelling : application to band assignments in the infrared spectra of metal complexes
… to band assignments in the infrared spectra of metal complexes. ¹⁵N- and ²H-labelling are applied to three classes of transition metal coordination compounds.
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Model complexes for active sites of diiron metalloproteins, dioxygen reactivity and water effects
… [Fe₂...CR)]³⁺ Complexes with Carboxylate-Rich Metal Coordination Environment as Models for Diiron Centers in Oxygen-Dependent Non-Heme Enzymes. Utilizing hydrogen bonding interactions and sterically bulky carboxylates, synthetic routes were developed to prepare the mononuclear iron(II) …
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The role of protein metal complexes in the mechanics of Mytilus californianus byssal threads
Protein-metal coordination complexes are well known as active centers in enzymatic catalysis, and to contribute to signal transduction, gas transport, and to hormone function. Additionally, they are now known to contribute as load-bearing cross-links to the mechanical properties of several …
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Mechanical properties of gels formed by nickel and cobalt complexation with histamine-grafted polyisoprene and polystyrene in non-aqueous solvents
Leveraging metal-coordination crosslinks for materials design of polymers can enable fine-tuning of the mechanical properties of rubbers without requiring the use of sophisticated vulcanization pathways. In this work, we synthesized several polyisoprene-graft-histamine gels in toluene, coordinated …
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Technetium-Labeled Receptor-Specific Radiopharmaceuticals: Synthesis of oxorhenium(V) Mimics of Steroid Hormones Based on the Integrated Approach
Tetradentate oxorhenium(V) coordination motifs were subsequently investigated as possible modes by which the metal-chelate may be incorporated into a steroid-like structure. A novel amine amide thioether thiol (AATT) chelation paradigm was devised to replace the C and D rings of the steroid with a …
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Phenylene Ethynylene Foldamers: Cooperative Conformational Transition, Twist Sense Bias, Molecular Recognition Properties, and Solid -State Organization
… biased conformation in nonpolar solvents. The metal coordination properties of several oligomers substituted with cyano groups were determined by UV-vis, fluorescence spectroscopy, proton NMR spectroscopy, electrospray mass spectrometry and isothermal microtitrational calorimetry. These results …
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