Molecular Metal Phosphate Complexes


Mgr. Jan Chyba


Department of Chemistry

Masaryk University, Faculty of Science

Brno, Czech Republic, 2010


Abstract


Zeolites and structurally related metallophosphates are an important class of inorganic materials.
Their useful physical and chemical properties predetermine these materials for applications as
desiccants, sorbents, catalysts, catalyst supports or ion exchangers.


Aqueous synthetic methods were mainly used for the preparation of various metallophosphates. We are
interested in developing nonaqueous alternative routes to these materials through molecular
building units possessing reactive functional groups to form framework systems in subsequent
reaction steps.


We focused on the synthesis of monometallic molecular Al, Ti, Zr and Zn metallophosphates. We
performed condensation reactions between selected derivates of phosphoric acid and metal alkyls,
alkoxides or amides, which provided molecular metallophosphates of different shapes and metal
nuclearities. (Fig. 1)


The prepared products were characterized by analytical and spectroscopic methods (multinuclear NMR,
IR, ESI-MS, thermal analysis). The single-crystal X-ray diffraction analysis revealed inorganic
cores wrapped in the organic coats formed by reactive functional groups. Potential application of
the prepared compounds as building blocks for porous frameworks or precursors for CVD deposition of
thin layered films on various substrates will be discussed.





                         Fig. 1: Molecular structure of aluminum phosphate