Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 10: FV-internes Symposium "Molecular Magnetism" (Organizer: H.J. Krüger)

MA 10.5: Hauptvortrag

Samstag, 5. März 2005, 11:00–11:30, TU H1012

Synthetic approaches to oxygen-bridged molecular magnets — •Annie Powell — Institut für Anorganische Chemie, Universität Karlsruhe, Engesserstr. 15, 76128 Karlsruhe

Hydrolysis reactions are a feature of the chemistry of many metal ions and usually lead to the formation of oxo- and hydroxo-bridged aggregates and then hydroxide, hydroxyoxide or oxide minerals. This chemistry can be controlled by supplying templating ligands which direct the size and shape of the intermediate aggregated species in a manner similar to that employed in Nature in biomineralisation processes. This makes it possible to favour the formation of molecular polymetal-oxo clusters which for paramagnetic metal ions have different magnetic properties from the related extended mineral phases as a result of the strong boundary effects operating in such systems. Furthermore, it is possible to functionalise the encapsulating ligands or supply linking synthons in order to enhance different types of supramolecular interactions amongst the molecules. This makes it possible to create 1-D chains, 2-D sheets or 3-D arrays of linked magnetic particles.