SYNTHESIS AND CHARACTERIZATION OF A NOVEL ALUMINOPHOSPHATE WITH LAYER STRUCTURE

An aluminophosphate with a layer structure has been synthesized hydrothermally. The ratio P Al = 2 for the framework; its structure consists of Al-centered tetrahedra and P-centered tetrahedra as basic building units to form a two-dimensional layer structure. The protonated ethylenediamine molecules are located in the interlayer space and sustain the framework. The water molecules are located in the space between two layers. Layers are joined together by van der Waals force to form a three-dimensional structure which crystallizes in the space group Pbnb, with a = 8.052(6), b = 8.760(2), c = 17.037(7), Å, and V = 1201.88, Å3. The crystal structure has been refined to yield values of R = 0.0418, Rw = 0.0447. © 1990.