Titelaufnahme

Titel
Ligandenaustauschreaktionen an Übergangsmetall Oxo Clustern und ihre Anwendung in der Synthese von organisch-anorganischen Hybridmaterialien / Johannes Kreutzer
VerfasserKreutzer, Johannes
Begutachter / BegutachterinSchubert, Ulrich
Erschienen2015
Umfang154
HochschulschriftWien, Techn. Univ., Diss.
Anmerkung
Arbeit an der Bibliothek noch nicht eingelangt - Daten nicht geprueft
SpracheEnglisch
DokumenttypDissertation
Schlagwörter (DE)Cluster / Übergangsmetall / Ligandenaustausch / Hybridmaterialien
Schlagwörter (EN)Cluster / transition metal / ligand exchange / hybrid materials
URNurn:nbn:at:at-ubtuw:1-79002 Persistent Identifier (URN)
Zugriffsbeschränkung
 Das Werk ist frei verfügbar
Dateien
Ligandenaustauschreaktionen an Übergangsmetall Oxo Clustern und ihre Anwendung in der Synthese von organisch-anorganischen Hybridmaterialien [11.73 mb]
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Zusammenfassung (Englisch)

Ligand exchange reactions of transition metal oxo clusters and the impact of modification of the ligand sphere of the clusters on properties of the hybrid materials was investigated. Ligand binding energies of the ligands were calculated by means of DFT calculations. Different basis sets and functionals were evaluated with respect to a sufficiently accurate description of the geometry and the vibrational modes of the cluster Zr4O2(OMc)12 (OMc=methacrylate). Ligand binding energies of the methacrylate ligands with respect to different positions on the cluster and to electronic effects of different substituents on the ligands were also investigated. The methacrylate ligands of Zr4O2(OMc)12 were completely exchanged with pivalic acid to verify that exchange reactions with carboxylic acids on Zr4O2(OMc)12 proceed under retention of the cluster core. Ligand exchange with different sterically demanding ligands was probed and the steric influence on the equilibrium reaction investigated. Scrambling reactions between clusters with the same cluster core but different ligands were investigated by two-dimensional NMR spectroscopy and are a second preparative route to mixed-ligand clusters. The question of site-selective ligand exchange was investigated by exchange of chelating carboxylate ligands with acetylacetonate. However, the stability of the cluster core seems to be of uttermost importance in this reaction. Besides successful site-selective ligand exchange, rearrangement of clusters and degradation was also observed. The impact of ligand exchange reactions on properties of hybrid materials was investigated. Furthermore, bifunctional clusters were synthesized by ligand exchange reactions and used in STED lithography experiments to obtain reactive nanostructures.