Crystals of three novel highly porous aluminophosphates, namely, α-NaAlPO₄(OH) (1), β-NaAlPO₄(OH) (2) and Al_3.5P_5.5O₁₉ (3), were synthesized through mild hydrothermal methods. Interestingly, among these three porous aluminophosphates, 1 is polar, whereas the other compounds are nonpolar and centrosymmetric. The 3D framework structure of 1 is built from AlO₆ octahedra and isolated PO₄ tetrahedra. 1D Al-chains are linked by PO₄ tetrahedra via sharing corners, forming the 3D framework, and 1D 8-membered ring (MR) tunnels were observed along the c-axis. Importantly, the material of 1 exhibits a 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-axes. 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-axes 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 Al_3.5P_5.5O₁₉ (3) as well as their elemental analysis, thermal stability, infrared spectroscopy, UV-vis diffuse reflectance and nonlinear optical (NLO) properties are also reported.

中文翻译：

---

轻度热液合成具有独特的三维开放骨架结构的高孔隙度铝磷酸盐

的三种新的高度多孔的铝磷酸盐，晶体即α-NaAlPO ₄（OH）（1），β-​​NaAlPO ₄（OH）（2）和Al _3.5 P _5.5 ø ₁₉（3），是通过水热温和的方法合成。有趣的是，在这三种多孔铝磷酸盐中，1是极性的，而其他化合物是非极性的和中心对称的。的三维骨架结构1是由内置的AlO ₆八面体和分离的PO ₄四面体。一维铝链通过PO ₄四面体通过沿c轴观察到共有角，形成了3D框架，并观察到1D 8元环（MR）隧道。重要的是，材料1表现出中等的二次谐波生成（SHG）效果。2具有独特的3D阴离子骨架，该骨架由角共享[Al ₂ O ₁₁ ]二聚体和孤立的PO ₄四面体组成。可以观察到沿轴线的三个相交的隧道。沿c轴的小隧道基于4-MR，而两个6 MR沿a和b轴。3的结构显示基于面部共享[Al ₂ O的独特3D框架。₉ ]二聚体和分离的PO ₄四面体。沿a和b轴的小隧道基于4-MR，而一维较大的隧道基于c轴的12MR。这里，所述合成和拓扑结构α-NaAlPO ₄（OH）（ 1），β-​​NaAlPO ₄（OH）（ 2）和Al _3.5 P _5.5 ø ₁₉（ 3）以及它们的元素分析，热稳定性，红外线还报道了光谱学，紫外可见漫反射和非线性光学（NLO）特性。