New organosilicon compounds: polysilydianions - synthesis and reactivity; synthesis of silsequioxanes; cyclosilazanes; novel silaheterocycles by carbenoid and diazo reactions; the quest for silaketene; biocatalysis in preparative organosilicon chemistry. Silicon based materials: trisiloxane surfactants; synthesis, functionalization and cross-linking reactions of poly(Silylenemethylenes); silicone rubbers; polyfunctionalization of polysiloxanes; fumed silica structure and particle aggregation; application of functionalized polysilanes in organic light emitting diodes.