On the possibility of the preparation open framework manganese phosphate

Abstract

Manganese(ll)/phosphate/organic template hydrothermal reactions were investigated with the aim of preparing novel crystalline porous materials. Ethylenediamine, isopropylamine, and piperidine were explored as organics that would be able to organize oxide moieties of Mn(II) and P(V) into a porous MnPO, crystalline lattice. The synthesis in the presence of ethylenediamine yields a product with the double protonated organic entrapped in the void space of the crystal. However, the products obtained in the presence of isopropylamine and piperidine do not contain any organics. It seems that the only role of isopropylamine and piperidine in the crystallization of MnPO material is that of a base. Total removal of the occluded species occurs at around 3OO”C, after which the manganese phosphate products become X-ray amorphous.