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3-methylaminopropylamine as a templating agent in the synthesis of phosphate-based inorganic polymers

Jevtić Sanja O. (Faculty of Technology and Metallurgy, Belgrade)
Rajić Nevenka Z. (Faculty of Technology and Metallurgy, Belgrade)
Kaučič Venčeslav V. (National Institute of Chemistry, Ljubljana, Slovenia)

3-methylaminopropylamine (MPA) has been studied as a structure-directing agent (template) in the synthesis of open-framework phosphate-based materials. The influence of temperature, molar ratio of reactants, crystallization time and presence of fluoride ions on the crystallization of aluminophosphate, transition metal-substituted aluminophosphate [transition metal - Mn(II), Cr(III) and Co(II)] and zincophosphate has also been investigated. MPA exhibits the templating role and in all as-synthesized crystalline products and it is entrapped in an inorganic lattice interacting with the framework via hydrogen or/and electrostatic interactions. According to detailed thermal analysis the type of interactions seems to be crucial for thermal behaviour of MPA and also for the thermal stability of the organic-inorganic crystal system. Structural analysis suggested that the formed crystalline structures have no mutual structural analogy. This indicates that precise role of the organic (guest) component in nucleation process for the open-framework phosphates (host) is very complex as well as the nucleation process itself.

Keywords: Microporous, aluminophosphates, MAPO, zinc phosphate, open-framework

Projekat Ministarstva nauke Republike Srbije, br. 172018