- Titel
- Tuning stacking interactions in 2D covalent organic frameworks for energy storage and environmental remediation
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa2-960534
- Übersetzter Titel (DE)
- Feinabstimmung von Stapelwechselwirkungen in 2D-kovalenten organischen gerustverbindung für Energiespeicherung und Umweltsanierung
- Erstveröffentlichung
- 2025
- Datum der Einreichung
- 25.09.2024
- Datum der Verteidigung
- 12.12.2024
- Abstract (EN)
- A new generation of porous materials, Covalent Organic Frameworks have emerged recently synthesized from organic moieties to form periodic networks having long range order. 2D COFs are a promising class of materials that are capable of achieving a range of applications from energy storage, conversion to gas storage and sensing. One grey area in this class of materials, particularly for their two-dimensional counterpart, is the packing of the 2D layers, which thereby affect crystallinity. This thesis highlights the precise tuning of the materials' stacking forces to exfoliate them or utilize the precisely stacked materials for focused applications in energy storage or environmental remediation. The stacking can be tuned by inducing repulsive forces in the molecular building blocks as dynamic side chains or using rigid units such as triple bonds. The utilization of these forces has been thereafter studied for their intrinsic stability in solutions for tailoring device applications. This leads to the proof-of-concept application to Li-ion batteries or for iodine-bromine separation. The functionalization of the COFs by alkyl side chains varying in lengths has been highlighted. This yielded a class of materials, which show a modulation of their interlayer distances. This can be used to target exfoliation of these layered 2D COFs to yield 2-3 atomically thin layered nanosheets, which form stable dispersions and are easily processable to be incorporated in membranes. Inspired by the results, the role of the co-linker with increased flexibility has been studied in the following chapter. Using solid state NMR, the formation of edge sites and defects have been probed. This was followed by design and synthesis of a novel heteroatom rich COF. Further, the tuning of stacking offsets has been investigated by introducing a completely rigid co-linker featuring alkyne bonds. The introduction of alkyne bridges induces a preferential zigzag offset between adjacent layer. This porous material has thus further been used to selectively capture bromine from a mixture of iodine and bromine.
- Verweis
- An Alkyne‐bridged Covalent Organic Framework Featuring Interactive Pockets for Bromine Capture
DOI: 10.1002/anie.202403658 - Manipulation of Covalent Organic Frameworks by Side-Chain Functionalization: Toward Few Layer Nanosheets
DOI: 10.1021/acs.chemmater.3c00048 - The Dilemma of Reproducibility of Gating Isotherms for Flexible MOFs
DOI: 10.1021/acs.langmuir.2c01999 - High-Field and Fast-Spinning 1H MAS NMR Spectroscopy for the Characterization of Two-Dimensional Covalent Organic Frameworks
DOI: 10.1039/d3cp04144a - Freie Schlagwörter (DE)
- Kovalent organische Gerüstverbindungen, Stapelung, Delaminierung, Iminbindung
- Freie Schlagwörter (EN)
- Covalent Organic Frameworks, Stacking
- Klassifikation (DDC)
- 540
- Klassifikation (RVK)
- VK 5807
- GutachterIn
- Prof. Dr. Stefan Kaskel
- Prof. Dr. Oliver Dumele
- Dr. Andreas Schneemann
- Den akademischen Grad verleihende / prüfende Institution
- Technische Universität Dresden, Dresden
- Förder- / Projektangaben
- Deutsche Forschungsgemeinschaft Collaborative Research Centre 1415 (CRC 1415)
Chemistry of Synthetic 2D Materials
ID: SFB-1415-417590517 - Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:14-qucosa2-960534
- Veröffentlichungsdatum Qucosa
- 11.03.2025
- Dokumenttyp
- Dissertation
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis
CC BY 4.0