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Showing 1 to 20 of 21 for “"Rotaxane"”.
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Synthetic studies towards an organometallic rotaxane
The synthesis of interlocking molecules such as rotaxanes and catenanes is a branch of supramolecular chemistry of particular current interest. The aim of this work was to assess the viability of the synthesis of an organometallic rotaxane in which the transition metal is covalently bonded to a …
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New Rotaxane Ligands with Donors on Both the Axle and Wheel
… the design, synthesis and characterization of [2]rotaxane, [2]pseudorotaxane and [3]rotaxane ligands and their resulting coordination to metal centers. Chapter 1 introduces the concepts of interpenetrated and interlocked molecules, molecular motion, metal-ligand interactions and metal organic …
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Insights into rotaxane formation enable cyclase engineering for lasso peptide diversification
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Linear, Branched and Crosslinked Polymers, Polyesters, Polyurethanes and Polymethacrylates Derived From Rotaxane Formation: Syntheses and Properties
As new family of composite materials, polyrotaxanes, polymers containing rotaxane units, have interested scientists world wide in last few decades because of their new properties. Crown ethers have been widely used as the cyclic component in various polyrotaxanes. However, due to significant loss …
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The synthesis and investigation of the electronic properties of crown ether, [2]-catenane, and [2]-rotaxane architectures
… of donor-acceptor architectures of the pseudorotaxane, rotaxane, and catenane genres. The binding constants of thiophene and phenylene-ethynylene based crown ethers are determined via fluorescence quenching titrations, in an attempt to correlate structure with binding affinities. The insight …
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New Liquid Crystalline [2]Rotaxanes
… study structure-property relationships between rotaxane design and mesomorphism. Chapter 1 introduces concepts of supramolecular chemistry and liquid crystals and cooperative effect between [2]rotaxane and liquid crystals towards functional molecular machines. In Chapter 2, a systematic approach …
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Cyclodextrin-based rotaxanes for material science applications
In the work described in this thesis, CD-based rotaxanes were prepared and their solid-state structures/packing, morphology and crystal growth behaviour were explored. Encapsulation of profluorescent nitroxides through rotaxane formation demonstrated the use of CD-based rotaxanes to change the …
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Cyclodextrin-based rotaxanes for material science applications
In the work described in this thesis, CD-based rotaxanes were prepared and their solid-state structures/packing, morphology and crystal growth behaviour were explored. Encapsulation of profluorescent nitroxides through rotaxane formation demonstrated the use of CD-based rotaxanes to change the …
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Designing conjugated polymer-based functional materials via the incorporation of supramolecular complexities
… of sensitive chemosensors. The incorporation of rotaxane moieties to poly(p-phenyleneethynylene)s will be described in Chapter Two. By design, the rotaxane groups behave as molecular recognition elements for the detection of small molecules. In addition, these bulky scaffolds prevent polymer …
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Syntheses and characterization of copper(I) complexes for study of dynamic supramolecular ring-chain equilibria and application as photoredox catalysts
… molecules (MIMs), such as rotaxanes, catenanes and pseudorotaxanes. The discovery of 1,10-phenanthroline and its use as a ligand for application in the coordination and supramolecular chemistry fields dates back to the late nineteenth century. As ligands, 1,10-phenanthroline …
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Molecular composites of a conducting polymer: syntheses and characterization of poly(1,4-phenylenevinylene)-crown ether rotaxanes
Polyrotaxanes, a new class of polymer architectures, so called molecular composites, are comprised of macrocycles threaded by linear backbones with no covalent bond between them. By using poly(1,4-phenylenevinylene) (PPV), one of the most promising conductive polymers, as the linear backbone and …
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Mechanically Interlocked Linkers for Dynamic Metal-Organic Frameworks
… all previous work towards incorporation of rotaxane linkers into metal-organic frameworks. Chapter 2 describes how a paradigm shift in the development of such systems resulted in a robust rotaxane linker that was used to create a novel material, UWDM-1 (University of Windsor Dynamic …
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New polymer architectures: synthesis and characterization of polyurethane-crown ether based polyrotaxanes
Rotaxane chemistry provides a new direction of research in polymer architectures. Unlike conventional polymers, polyrotaxanes are molecular composites comprised of macrocycles threaded by linear polymer backbones with no covalent bonds between the two components. This novel class of materials …
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Hydrogen Bond Template-Directed Synthesis of Recognition-Encoded Melamine Oligomers
… of the CuAAC reaction was investigated. A 7-mer rotaxane template was subjected to a templating cycle. Firstly, a macrocycle was covalently attached to the template. Addition of complementary REMO 3-mers and copper catalyst resulted in active templating to form a handcuffed duplex. Cleavage of …
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Synthesis and characterization of liquid crystalline polyrotaxanes based on poly(azomethine)s
Polyrotaxanes are new polymers. Macrocyclic molecules, such as crown ethers, are threaded by linear or branched polymer chains. There is no covalent bond between the crown ethers and the polymer backbone. After the crown ethers are threaded onto the polymer backbone, both ends of the polymer can be …
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Hydroxy and amidinium containing acyclic and interlocked anion receptors
… synthesis of two cationic hydroxy containing [2]rotaxanes and compares their anion binding abilities to a previously reported analogous [2]rotaxane without hydroxy groups. Along with 1H NMR solution anion binding studies, the binding modes of these three [2]rotaxanes to various anions was …
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Thermodynamically Driven (Reversible) End-Capping of Pseudorotaxanes to Produce Rotaxanes
Rotaxanes can be synthesized using a thermodynamically driven approach of self-assembly. The thermodynamically driven approach is an efficient method to provide a better controlled synthesis of specific structures. This synthetic approach takes advantage of a labile bond between the guest molecule …
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Mechanical Processes of a Single Synthetic Molecular Machine Studied by AFM-based Force Spectroscopy
… submolecular components in a hydrogen-bonded [2]rotaxane -a molecular ring threaded onto a molecular axle- can be harnessed to generate significant directional forces. We used the cantilever of an atomic force microscope to apply a mechanical load to the ring during single-molecule …
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Dibenzo-30-crown-10: Synthetic optimization and studies of the binding conformation
… supramolecular architectures such as catenanes, rotaxanes, and supramolecular polymers. They have been used as selective hosts in diverse applications such as wastewater treatment, switchable catalysis, therapeutic agents, sensors, molecular machines, and stimuli responsive materials "smart …
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