Hydrothermal synthesis and characterization of a Manganese (II)-substituted aluminum phosphate Mn₃Al₆(PO₄)₁₂· 4tren·11H₂O with 12-membered ring channel open framework

A three-dimensional manganese (II)-substituted aluminum phosphate, Mn₃Al₆(PO₄)₁₂ · 4tren·11H₂O[tren is tris (2-aminoethyl) amine], was synthesized hydrothermally. Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by X-ray powder diffraction, ICP, TG analyses and magnetic susceptibility measurements. It crystallizes in the cubicsystem, space group I-43 m(No.217) with a=l.68351(4) nm, V=4.7714(2) nm³, Z=2, R₁=0.0439 and wR₂=0.1324[I>2σ(I)]. The open framework built up from strict alternation of TO₄/AlO₄ and PO₄ tetrahedra through corner-sharing vertex oxygen atoms. It contains 12-membered ring channels. The Mn atoms of the framework are bivalence proved by magnetic susceptibility measurements.