C 2-Prof. f. Anorg. Chemie (Malisch)
Am Hubland, 97074 Würzburg
Research foci (and basic equipment-based research projects):
Transition metal complexes with a metal silicon bond act as intermediates in catalytic transformations, like the hydrosilylation reaction, which is also of industrial interest. The main target of our studies is focused on the influence of the transition metal fragment on the stability and the condensation behaviour of metallo-silanols including systems with direct M-Si bond as well as derivatives, in which the metal and the silanol unit is separated by a spacer group. Another aspect is the condensation of these metallo-silanols with organochlorosilanes giving access to transition metal fragment substituted siloxanes. These systems can serve as model compounds for SiO2-fixed catalytic systems or as precursor compounds for raw materials.
Our detailed reactivity studies on transition metal substituted silanols of the chromium and iron groups reveal an enormous increase of the stability of these compounds with respect to self-condensation compared to organo-substituted derivatives known from the industrial synthesis of silicones. In addition, metallo-silanols are highly potential precursors for the controlled synthesis of metallo-siloxanes with bridging Si-O- or SiOSi-units. Another advantage of metallo-silanols is the directing effect of the metal fragment, which can be used for the regioselective ligand exchange at Si-H- and Si-Cl-functional ferrio-disilanes.