Recently we started to discover new semiconducting transition metal - main group polyphoshides. Variations in the polyphosphide substructure from 0 dimensional molecular units, polymeric 1 dimensional strands and 2 dimensional layers can be stabilized combining group 11 and group 14/15 elements. New building units like M3Sn heteroclusters (M = Au) and the first inorganic material with covalent Sb-P interactions have been prepared by main group halide mineralization reactions at elevated temperatures. One key finding is the new and effective route to black phosphorus which makes this allotrope now available for large scale applications. Due to their physical properties these polyphosphides are potential candidates for electrochemical applications.
RE-T-Pnictide oxides (RE = Rare Earth metals; T = Transition metals)
Pnictide oxides of various compositions (ternary alkaline earth pnictide oxides, quaternary rare earth - transition metal pnictide oxides and actinide - transition metal pnictide oxides) have been structurally characterised. Those materials are build up from alternating metal-oxide and metal-phosphide layers which are separated by metal ions in some cases. Apart from the crystal structures the physical properties are only barely characterised. In addition to the preparation of new materials we are interested in the determination of the physical properties like magnetic susceptibility, Hall effect, electrical and magneto resistivity and their optical and magnetooptical behaviour.