Highly Porous Aluminophosphates with Unique Three Dimensional Open Framework Structures from Mild Hydrothermal Syntheses
Crystals of three novel highly porous aluminophosphates, namely, α-NaAlPO4(OH)(1), β-NaAlPO4(OH)(2) and Al3.5P5.5O19(3), were synthesized through mild hydrothermal methods. Interestingly, among these three porous aluminophosphates, 1 is polar, whereas other compounds are nonpolar and centrosymmetric. The 3D framework structure of 1 is built up by AlO6 octahedra and isolated PO4 tetrahedra. 1D Al-chains are linked by PO4 tetrahedra via sharing corners, forming the 3D framework, 1D 8-Membered Rings (MRs) tunnels were observed along the c-axis. Importantly, the material of 1 exhibits moderate second harmonic generation (SHG) effect. 2 features a unique 3D anionic framework composed of corner-sharing [Al2O11] dimers and isolated PO4 tetrahedra. Three intersecting tunnels along the axes can be observed, the small tunnels along the c-axis are based on 4-MRs, whereas the two 6-MRs are along the a- and b-axis. The structure of 3 displays a unique 3D framework based upon face-sharing [Al2O9] dimers and isolated PO4 tetrahedra. The small tunnels along the a-and b-axis are based upon 4-MRs, whereas the 1D larger tunnels are based on 12-MRs along the c-axis. Here, the syntheses and topological structures of α-NaAlPO4(OH)(1), β-NaAlPO4(OH)(2) and Al3.5P5.5O19(3), as well as their elemental analysis, thermal stability, infrared spectroscopy, UV-vis diffuse reflectance and nonlinear optical (NLO) properties are also reported.