3-(Methylamino)propylamine as a templating agent in the synthesis of phosphate-based inorganic polymers

Abstract

3-(Methylamino)propylamine (MPA) was studied as a structure-directing agent (template) in the synthesis of open-framework phosphate-based materials. The influence of temperature, mole 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 was also investigated. MPA exhibited a templating role and in all the as-synthesized crystalline products, 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 inter-actions seems to be crucial for the thermal behavior of MPA and for the thermal stability of the organic-inorganic crystal system. Structural analysis suggested that the formed crystalline structures had no mutual structural analogy. This indicates that the precise role of the organic (guest) component in nucleation process for the open-framework phosphates (host) is very complex as is the nucleation process itself. .

3-(Metlamino)propilamin (MPA) izučavan je kao strukturni agens (templat) u sintezi poroznih materijala na bazi fosfata. Uticaj temperature, molskog odnosa reaktanata, vremena i prisustva fluorid-jona na kristalizaciju alumofosfata, alumofosfata koji u rešetki sadrže jone prelaznih elemenata (prelazni element - Mn(II), Cr(III) i Co(II)) takođe su izučavani. MPA ispoljava svojstva templata i u svim sintetisanim kristalnim proizvodima zarobljen je u neorganskoj rešetki sa kojom ostvaruje vodonične i/ili elektrostatičke interakcije. Prema detaljnoj termičkoj analizi vrsta interakcija je od presudnog značaja za termička svojstva MPA kao i termičku stabilnost čitavog organsko-neorganskog kristalnog sistema. Strukturna analiza je ukazala da među nastalim kristalnim strukturama nema sličnosti. Ovo ukazuje da je uloga organske ('gostujuće') komponente u procesu nukleacije poroznih fosfata složena kao i sam proces nukleacije. .