Research

Our major interest focus on the synthesis, structures and properties of coordination polymers on the basis of transition metals and N-donor ligands. In contrast to "discrete" complexes, in coordination polymers the metal atoms are connected by the ligands into 1D, 2D or 3D coordination networks. One major goal in this field is the development of strategies for a more rational design of their structures based on simple considerations concerning the nature of the metal atoms and the coordination properties of the ligands.
Correlated with this topic we are also interested in the polymorphism and pseudopolymorphism of metal organic and pure organic compounds. In this context not only the structural aspects of polymorphism are of importance. We are also interested in the thermodynamic aspects of this phenomenon.

One further project focus on investigations on the thermal properties of coordination polymers in order to prepare new liganddeficient compounds by thermal decomposition of suitable ligand rich precursor compounds. With this method new intermediate compounds can be prepared which cannot be obtained in solution or which are always obtained as mixtures if the synthesis is performed in the liquid phase. Moreover, the intermediates are always obtained in quantitative yields and very pure by this approach.Beside the thermal properties of such compounds also the magnetic and optical properties are investigated because several of these compounds shows cooperative magnetic exchange interactions or luminescence and thermoluminescence. In some other compounds solvent molecules can reversibly deintercalated and intercalated which is accompanied by dramatic changes of the physical propeties of these compounds.

In all investigations we are mainly interested in correlations between the structure of the compounds, their chemical reactivity and their physical properties. For our investigations we use different analytical methods. This includes single crystal X-ray diffraction for structure determination, X-ray powder diffraction for the identification of compounds and to determine their homogeneity. The thermal properties are investigated using temperature dependet X-ray powder diffraction, simultaneousd differential thermoanalysis and thermogravimetry coupled to mass spectroscopy, as well as differential scanning calorimetry and thermomicroscopy. In addition, energy dispersive X-ray analysis and different spectroscopic methods are also used.