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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 12 of 12 for “"catenane"”.
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CONTROLLED SYNTHESIS OF TOPOLOGICALLY TEMPLATED CATENANE AND KNOTTY POLYMER
… topologically interesting structure of polymer catenanes and knotty polymers are of high interest for their unique chemical and physical properties. However, the practical applications of these materials have not been explored well due to synthetic obstacles in obtaining high yields. Chapter 1 …
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The synthesis and investigation of the electronic properties of crown ether, [2]-catenane, and [2]-rotaxane 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 obtained from the binding …
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Synthesis of oligonucleotide analogues for use in DNA nanostructures
… synthesis of a very stable double stranded<br/>catenane duplex. The catenane was formed from a single stranded cyclic template and<br/>its linear complement, using a third short oligonucleotide (ODN) as a helper for the<br/>circularisation of the second ODN. The copper(I)-catalysed cyclisation …
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Subcomponent self-assembly of cages and mechanically interlocked molecules
… 5-methoxy-2-formylpyridine gave S₄-symmetric [2]catenane-type structures with the formula CuI₁₂L₈. Use of 3-methyl-2-formylpyridine gave an S₄-symmetric, CuI₆L₄ cage at 253 K at low concentrations, but a large, more complex structure at higher concentrations. The identity of this structure is not …
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Dynamic combinatorial synthesis of donor-acceptor catenanes
… of a new generation of donor-acceptor [2]catenanes in aqueous dynamic combinatorial systems. The assembly of these [2]catenanes is promoted by a high salt concentration (1 M NaNO3), which raises the ionic strength and encourages hydrophobic association. More importantly, a mechanism that …
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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 (and …
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Supramolecular architectures: macrocycles, catenanes and polyrotaxanes
… products was demonstrated. The 42-crown-based [2]catenane was isolated while synthesizing "42- crown-14" and characterized in terms of its physically interlocked structure. Two new hydrocarbon-based macrocycles were prepared by two-piece combination method.
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Towards interlocked structures based on H-bonded barbiturate complexes
… interlocked structures, such as rotaxanes or catenanes. This thesis demonstrates the feasibility of such structures. A series of Hamilton-like receptors has been synthesised. Their conversion from “open” to “closed” forms by metathesis and their binding with barbital was studied, demonstrating …
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New hydrogen bonding motifs for anion and neutral guest complexation
… The synthesis of a neutral guest templated catenane was also attempted in an effort to expand on the simple cleft work.<br/>Finally, a new triazole strapped calix[4]pyrrole synthesised by ‘click’ chemistry is reported. The receptor shows a high affinity for chloride and bicarbonate in MeCN …
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EXPLORING NOVEL SUSTAINABLE SYNTHETIC METHODOLOGIES WITH NITRO COMPOUNDS
… the optimization of the synthesis of a novel catenane is discussed and the preliminary data about its use as an organocatalyst in acylation reactions are summarized.
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Cucurbit[n]uril-engineered Nano-constructs for Molecular Sensing
… the preparation of surface-bound CB[8] catenanes on silica NPs, where CB[8] is employed as a tethered supramolecular "receptor" to selectively capture target guest molecules. More specifically, CB[8] is threaded onto a methyl viologen (MV2+) axle and immobilised onto silica NPs with a …
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Hydroxy and amidinium containing acyclic and interlocked anion receptors
… synthesis of two neutral catechol containing [2]catenanes templated by a spiroborate linkage, the syntheses of the analogous macrocycles and a neutral acyclic catechol containing model receptor. The anion binding capabilities of these acyclic, macrocyclic and interlinked receptors are reported …