Ehret, Edouard (2024). Self-Assembly of Amphiphilic Oligophosphates into Supramolecular Polymers. (Thesis). Universität Bern, Bern
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Abstract
Supramolecular polymers are a unique class of materials. They offer dynamic and reversible characteristics which separate them from conventional polymers. Their self-assembling behavior, as well as their singular properties, are described in Chapter 1. This introduction, with a focus on the self-assembly of oligomers in aqueous media, explores the possibility of introducing chemical modifications into oligomers to form functionalized supramolecular polymers. The introduction is followed by elucidating the aim of the thesis in Chapter 2. Chapter 3 investigates the incorporation of a carbohydrate moiety into phosphodiester-linked pyrene oligomers. The synthesis and self-assembly behavior of several carbohydrate-modified pyrene oligomers are described. The controlled aggregation of the oligomers, resulting in the formation of two distinct supramolecular polymers whose morphology was dictated by the pyrene isomer present in the oligomer construct. The Chapter 4 explores the possibility of observing the self-assembly of oligomers lacking intramolecular π-π interactions, in aqueous media. The synthesis of a small library of cholane-PAH-cholane oligomers (CPC) and their self-assembly properties and morphologies are detailed. The supramolecular assembly of the different CPCs resulted in the observation of three distinct nanostructures - sheets, tubes and worms. Chapter 5 describes the light-harvesting properties of the different phenanthrene CPC assemblies, in the presence of the pyrene CPCs, under different aggregation conditions. The efficiency of the different donor-acceptor couples are discussed and the most efficient system is presented. The final chapter provides an overall conclusion on the work performed and highlights potential future perspectives.
| Item Type: | Thesis |
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| Dissertation Type: | Single |
| Date of Defense: | 10 September 2024 |
| Subjects: | 500 Science > 540 Chemistry |
| Institute / Center: | 08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
| Depositing User: | Hammer Igor |
| Date Deposited: | 02 May 2025 10:19 |
| Last Modified: | 02 May 2025 10:19 |
| URI: | https://boristheses.unibe.ch/id/eprint/6093 |
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