Eintrag in der Universitätsbibliographie der TU Chemnitz
Volltext zugänglich unter
URN: urn:nbn:de:bsz:ch1-qucosa2-1048313
Thomas, Rico
Mehring, Michael (Prof. Dr.) ; Lang, Heinrich (Prof. em.) (Gutachter)
About bismuth oxido nanoclusters: A study on lanthanide doping and ligand shell modification towards new properties
Über Bismutoxidonanocluster: Eine Studie zur Dotierung mit Lanthaniden und zur Modifizierung der Ligandenhülle im Hinblick auf neue Eigenschaften
Kurzfassung in englisch
Atomically precise nanoclusters (NCs) are the long-overlooked connection between nanoparticles (NPs) and molecules. These compounds are considered model compounds for the corresponding NPs and are of particular interest for drawing conclusions about their properties. Such NCs have the advantage of a uniform molecular structure, which allows for precise analysis using both solid-state and molecular characterization methods. This thesis focuses on the functionalization, synthesis, and characterization of novel bismuth oxido nanoclusters (BiO-NCs) comprised of a [Bi38O45] core, which are of general interest due to their high stability and environmentally benign nature. In terms of functionalization, on the one hand the ligand exchange at the cluster ligand shell and on the other hand the doping of the [Bi38O45] NC core with lanthanides were investigated. The simultaneous hydrolysis of bismuth(III) nitrate and the respective lanthanide(III) nitrate resulted in the formation of doped BiO-NCs of the type [Bi38O45(NO3)24(dmso)28–y]:Ln. These NCs exhibit lanthanide-specific optical and magnetic properties, including photoluminescence, visible-light absorption, or paramagnetic moment, within a shielding bismuth oxido matrix even at low doping contents of about 1 ω%. The nitrate ligands in the cluster periphery of doped and undoped clusters were completely substituted by various carboxylate ligands while maintaining the cluster core structure. This ligand exchange leads to improved solubility in common organic solvents and enables the addition of chiral information to the clusters, when using chiral amino acids as ligands. Additionally, the opposing influences of doping and ligand substitution on each other, as well as the resulting properties of the clusters, were analyzed. The combination of both functionalization methods resulted in processable BiO-NCs with various unique properties. These nanoclusters gave insights into effects which are expected to be similarly characteristic in doped bismuth oxide NPs and are suitable for further investigations towards new materials. With regard to the latter, the production of thin chiral BiO-NC films on metal surfaces and the incorporation of europium doped BiO-NCs into a polymer matrix showing red luminescence were investigated. For the characterization of the BiO-NCs and the synthesized materials, a variety of different microscopic, spectroscopic, and thermal characterization methods were used in addition to X-ray diffraction and electrospray mass spectrometry.
| Universität: | Technische Universität Chemnitz | |
| Institut: | Professur Koordinationschemie | |
| Fakultät: | Fakultät für Naturwissenschaften | |
| Dokumentart: | Dissertation | |
| Betreuer: | Mehring, Michael (Prof. Dr.) | |
| DOI: | doi:10.60687/2026-0100 | |
| SWD-Schlagwörter: | Dotierung , Photolumineszenz , Abscheidung | |
| Freie Schlagwörter (Deutsch): | Bismut , Lanthanoide , Aminosäuren | |
| Freie Schlagwörter (Englisch): | atomically precise nanocluster , bismuth oxido cluster , doping , lanthanides , ligand exchange , amino acids , chirality , photoluminescence , deposition | |
| DDC-Sachgruppe: | Chemie | |
| Sprache: | englisch | |
| Tag der mündlichen Prüfung | 11.05.2026 | |
| OA-Lizenz | CC BY 4.0 |
