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 36 for “"supramolecular complexes"”.
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Metallo-Supramolecular complexes and their interactions with biomolecules and cells
Chapter 1 introduces the field of supramolecular chemistry and reviews examples of supramolecular architectures. Applications of these assemblies are outlined with a focus on DNA recognition. In chapter 2 the synthesis and characterisation of an array of palladium(II) and platinum(II) …
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Synthesis and photophysical investigation of supramolecular complexes developed for photoinitiated electron collection
… The ruthenium mono- and bimetallic complexes utilizing these bridging ligands, as well as dpb, were synthesized and investigated. It was shown that the light absorbing and electrochemical properties of these [Ru(bpy)₂(BL)]²⁺ chromophores can be varied by altering the π-acceptor …
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Improving Photocatalytic Hydrogen Production of Ru,Rh,Ru Supramolecular Complexes in Aerobic Aqueous Solutions
… community. Hydrogen production efficiencies for supramolecular photocatalysts of the architecture [{(TL)2Ru(BL)}2RhX2]5+ (BL=bridging ligand, TL=terminal ligand, X=halide) are among the highest reported in deoxygenated organic solvents, but do not function in air-saturated aqueous solution due to …
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Quantification of Supramolecular Complexes Involving Charged Species in Non-Aqueous Solvents: Theory and Application
… crown by the di- or tri-topic anions, forming supramolecular bicyclic macrocycles (pseudocryptands) and stabilizing the complex in a cooperative manner. Significantly, Ka,exp of one of the pseudocryptands was shown to equal that determined in the corresponding cryptand complex.
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Multimetallic Supramolecular Complexes: Synthesis, Characterization, Photophysical Studies and Applications in Solar Energy Utilization and Photodynamic Therapy
… of excited state properties of these complexes. Supported by the electrochemical data and spectroelectrochemistry, the hexametallic complex was suggested to have a HOMO localizing in the peripheral Os and a LUMO localizing in the central dpq, separating by a Ru energy barrier. This …
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Modification of Excited State Behavior with Ligand Substitution in Ru(II),Rh(III) Bimetallic Supramolecular Complexes
… 93 ns while the excited state lifetimes of the complexes with a bpy or Me₂bpy terminal ligand were 44 ns and 47 ns, respectively. Ligand substitution was shown to influence the photocatalytic water reduction activity of these complexes with the dcmbpy complex producing approximately twice the …
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Design, Synthesis and Characterisation of π-Extended Viologen-Based Molecular and Supramolecular Complexes with Cucurbit[n]urils
… stoichiometry of V$^{2+}$ based inclusion complexes make these systems highly attractive for supramolecular chemistry and dynamic nanosystems, $\textit{i.e.}$ molecular machines. % This doctoral thesis focuses on design, synthesis and characterisation of $\pi$-extended viologen-based …
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Probing the Redox and Photophysical Properties of Ru(II)-Pt(II) Supramolecular Complexes as Efficient Photodynamic Therapy Agents
Mixed-metal Ru(II)-Pt(II) supramolecular complexes having the [(Ph₂phen)₂Ru(BL)PtCl₂]₂+ (Ph₂phen = 4,7-diphenyl-1,10-phenanthroline, and BL (bridging ligand) = dpp = 2,3-bis(2-pyridyl)pyrazine, or dpq = 2,3-bis(2-pyridyl)quinoxaline) structural motif were synthesized and their redox, photophysical, …
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Labile Ligand Variation in Polyazine-Bridged Ruthenium/Rhodium Supramolecular Complexes Providing New Insight into Solar Hydrogen Production from Water
Mixed-metal supramolecular complexes containing one or two 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 …
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The stereochemistry of selected supramolecular complexes of cucurbiturils and the effect of homogeneous equilibria and electron transfer of the guest
"From a practical perspective, host-guest complexes are vehicles for understanding and using supramolecular interactions for purposeful function in sensors, molecular machines and switches, while from a fundamental perspective they may lead to novel supramolecular protection schemes in basic …
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Design and Synthesis of Mixed-Metal Supramolecular Complexes Incorporating Specialized Light Absorbing Units to Investigate Processes Relevant to Catalyst Function
… research was to develop a series of mixed-metal supramolecular complexes with specialized light absorbing units to probe perturbation of excited-state properties by ligand deuteration and long-term complex stability via racemization of initially enantiopure light absorbing subunits. Varying …
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Molecular interactions in pharmaceutical preformulation and supramolecular complexes. Structural properties governing drug-plasma protein binding and investigation of amino acids co-crystals
… interactions also play a key role in the supramolecular complexes of co-crystals. The project also evaluated the co-crystallisation process and its effect on physicochemical properties of the drug. In the current study, amino acids (AAs) have been observed to be a prominent source of …
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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
… 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 multielectron reduction. These complexes are active photocatalysts for …
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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
… research was to develop a series of mixed-metal supramolecular complexes through systematic component variation to better understand the role of structural modification on basic chemical and photochemical properties including photocatalysis of H₂O to H₂. Varying bidentate polypyridyl terminal …
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A general method for three color STED microscopy with one depletion laser : application to primary neuronal culture
… and postsynaptic compartments. How exactly these supramolecular complexes are modified through time and experience, though, remains largely unknown. Moreover, the mechanisms by which pre- and postsynaptic protein organization specifies the biochemical and electrophysiological properties of a …
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Tuning the Photophysical and Biological Properties of a Series of Ruthenium-Based Chromophores and Chromophore Coupled Cisplatin Analogs with Substituted Terpyridine Ligands
… with DNA and other biomolecules. A series of supramolecular complexes of the form [(TL)RuCl(dpp)](PF₆) and [(TL)RuCl(BL)PtCl₂](PF₆) with the BL (bridging ligand) = 2,3-bis(2-pyridyl)pyrazine (dpp) and varying TL (terminal ligand) (tpy = 2,2'':6'',2''-terpyridine, MePhtpy = …
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Crystallographic refinement of thermal parameters using normal modes
… for the refinement of very large and flexible supramolecular complexes at moderate resolutions.
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Designing conjugated polymer-based functional materials via the incorporation of supramolecular complexities
… unique photophysical and/or redox properties, supramolecular systems and conjugated polymers (CPs) have emerged as the ideal candidates for such applications. This dissertation details the design and synthesis of various CPs with pendant supramolecular complexes. The marriage of these two …
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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
… 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 Rh-'Cl bond, [(bpy)2Ru(dpp)RhCl(tpy)](PF6)4 ( bpy = 2,2'-bipyridine, tpy = …
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Surface Functionalizations towards Nucleic Acid Purification: a nanoscale study
… associate to a single strand of mRNA, forming supramolecular complexes known as polyribosomes (polysomes).This project is aimed at developing and studying a miniaturized purification system able to isolate and extract polysome-associated mRNA, namely mRNA under active translation. The resulting …
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