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 16 of 16 for “"polyazine"”.
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Mixed-Metal Ruthenium-Platinum Polyazine Supermolecules: Synthesis, Characterization and Exploration of DNA Binding
… the DNA-binding properties of select ruthenium polyazine complexes, the approach was to bind the cis-PtIICl2 active site of cisplatin to ruthenium light absorbers using the dpq and dpb bridging ligands (where dpq = 2,3-bis(2-pyridyl)quinoxaline, dpb = 2,3-bis(2-pyridyl) benzoquinoxaline). These …
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Heteronuclear trimetallic polyazine complexes of iridium (III) or rhodium (III) as electrocatalysts for the reduction of CO2
The research investigations involved in this thesis were focused on the development of multimetallic systems to function as electrocatalysts for the reduction of CO₂.
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Labile Ligand Variation in Polyazine-Bridged Ruthenium/Rhodium Supramolecular Complexes Providing New Insight into Solar Hydrogen Production from Water
… RuII light absorbing subunits coupled through polyazine bridging ligands to a RhIII reactive metal center were prepared for use as photocatalysts for the production of solar H2 fuel from H2O. The electrochemical, photophysical, and photochemical properties upon variation of the monodentate, …
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Synthesis and Study of Polyazine Bridged Mixed Metal Dyads: Electrochemical, Photophysical, and Photochemical Properties of a New Supramolecular Architecture
… The complexes consisted of a single RuII or OsII polyazine light absorber bound to a cis-RhIIICl2 moiety through a polyazine bridging ligand. A related class of supramolecule is known to perform photoinitiated electron collection, photocatalysis of hydrogen from water, DNA photomodification and is …
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Polyazine-Bridged Ru(II),Pt(II) Trimetallic and Tetrametallic Supramolecular Complexes Exhibiting Unusual Excited State Dynamics Important in Catalysis and PDT Drug Development
… research was to develop structurally diverse polyazine-bridged Ru(II),Pt(II) trimetallic and tetrametallic supramolecular complexes and study the impact of component variation on the redox, spectroscopic, and excited state properties that influence photoinduced charged separation and …
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Design and Modification of Polyazine-Bridged Ru(II),Rh(III) Bimetallic and Trimetallic Supramolecular Complexes Applicable in Solar Energy Harvesting for the Photocatalytic Reduction of Water to Hydrogen
… Rh(III) electron collector (EC) through dpp polyazine bridging ligands (BL). Ru(II),Rh(III) bimetallics of the design [(TL)₂Ru(dpp)RhCl₂(TL′)](PF₆)₃ (TL = Ph₂phen or bpy = 2,2′-bipyridine; TL′ = Ph₂phen or tBu2bpy = 4,4′-Di-tert-butyl-2,2′-bipyridine) couple only one Ru(II) LA to a Rh(III) …
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A Rhodium Centered Supramolecular Complex as a Photoinitiated Electron Collector
… of the form LA-BL-EC-BL-LA comprising a Ru(II) polyazine light absorber (LA) bearing two bpy (bpy = 2,2'-bipyridine) ligands, two dpp (dpp = 2,3'-bis(2-pyridyl)pyrazine) bridging ligands (BL), and a central rhodium(III) electron collector (EC). Ruthenium-polyazine light absorbers are commonly …
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New Polyazine-Bridged Ru(II),Rh(III) and Ru(II),Rh(I) Supramolecular Photocatalysts for Water Reduction to Hydrogen Applicable for Solar Energy Conversion and Mechanistic Investigation of the Photocatalytic Cycle
The goal of this research is to test the design constraints of active dpp-bridged RuII,RhIII (dpp = 2,3-bis(2-pyridyl)pyrazine)) supramolecular photocatalysts for water reduction to H2 and provide mechanistic insights into the catalytic cycle. Two member of a new RuII,RhIII motifs with only one …
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The Design, Synthesis and Study of Mixed-Metal Ru,Rh and Os, Rh Complexes with Biologically Relevant Reactivity
… bpy and Me2bpy ), which couple one Ru or Os polyazine light absorber (LA) to a cis-RhIIICl2 center through a dpp bridging ligand (BL), were synthesized using a building block method. These are related to previously studied trimetallic systems [{(TL)2M(dpp)2RhCl2]5+, but the bimetallics are …
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The synthesis and characterization of a new kind of tagged Ru-Pt bimetallic DNA binding agent
… used. The bridging ligands are those bidentate polyazine ligands that can connect two metal center together in a polymetallic system and have a low energy π* orbital. The BAS represents the bioactive sites for binding to DNA, in this case the cis-Pt<sup>II</sup>Cl₂ moiety based on previous …
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Supramolecular Ru II, Pt II Complexes Bridged by 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz)
… agents. Chapter 1 gives an overview on the metal polyazine supramolecules. More specifically, the section is focused on the tridentate ruthenium and platinum metallic supramolecular assemblies with emphasis on their functionality and the methods used to study such systems. Chapter 2 describes the …
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Metal-cyclam based Metal-Organic Frameworks for CO₂ Chemical Transformations
… (PDT) of cancer. In Chapter 5, two monometallic polyazine complexes, [(Ph₂phen)₂Ru(dpp)]²⁺ and [(Ph₂phen)₂Os(dpp)]⁺ (Ph₂phen = 4,7-diphenyl-1,10-phenanthroline; dpp =2,3-bis(2-pyridyl)pyrazine), were synthesized, characterized and studied as light activated drugs to kill rat malignant glioma F98 …
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Ruthenium-Platinum Polypyridyl Complexes: Synthesis and Characterization
A series of bimetallic (Ru<sup>II</sup>, Pt<sup>II</sup) complexes were synthesized with the general formula [(tpy)RuCl(BL)PtCl₂](PF₆) (tpy = 2,2':6',2"-terpyridine and BL = bridging ligand) and their spectroscopic, electrochemical, and DNA binding properties studied. The bridging ligands used in …
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Improving Photocatalytic Hydrogen Production of Ru,Rh,Ru Supramolecular Complexes in Aerobic Aqueous Solutions
The production of hydrogen fuel via solar water splitting is an important carbon-neutral strategy for the development of renewable resources and has sparked great interest in the scientific community. Hydrogen production efficiencies for supramolecular photocatalysts of the architecture …
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Probing the Redox and Photophysical Properties of Ru(II)-Pt(II) Supramolecular Complexes as Efficient Photodynamic Therapy Agents
… photodynamic therapy (PDT) activity through a polyazine bridging ligand (dpp or dpq) to a cis-PtCl₂ bioactive site for covalent binding to biological substrates. The bioactive site is comparable to the first generation Pt-based chemotherapy agent cisplatin, cis-[PtCl₂(NH₃)₂]. The Ph₂phen ligand …
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Design and Synthesis of Mixed-Metal Supramolecular Complexes Incorporating Specialized Light Absorbing Units to Investigate Processes Relevant to Catalyst Function
… two Ru(II) LAs to a central Rh(III) RM through polyazine BLs. The complexes discussed herein are synthesized using a building block approach, permitting modification of the supramolecular architecture through multiple synthetic steps. Electrochemical analysis of the mono-, bi-, and trimetallic …