ON THE POSSIBILITY OF THE PREPARATION OPEN FRAMEWORK MANGANESE PHOSPHATE

Manganese(II)/phosphate/organic template hydrothermal reactions were i nvestigated with the aim of preparing novel crystalline porous materia ls. Ethylenediamine, isopropylamine, and piperidine were explored as o rganics that would be able to organize oxide moieties of Mn(II) and P( V) into a porous MnPO4 crystalline lattice. The synthesis in the prese nce of ethylenediamine yields a product with the double protonated org anic entrapped in the void space of the crystal. However, the products obtained in the presence of isopropylamine and piperidine do not cont ain any organics. It seems that the only role of isopropylamine and pi peridine in the crystallization of MnPO material is that of a base. To tal removal I of the occluded species occurs at around 300 degrees C, after which the manganese phosphate products become X-ray amorphous.