An open framework aluminophosphate with unique 12-membered ring channels:: Al9(PO4)12(C24H91N16) • 17H2O

By using the hydrothermal method, a new large-pore three dimensional aluminophosphate Al-9(PO)(12)(C24H81N16). 17H(2)O has been synthesized. The compound crystallizes in the cubic space group I-43m with a 16.7963(13) Angstrom, V 4738.5(6) Angstrom(3), and Z = 2. The P/Al ratio of this compound is 4:3 and the structure consists of Al-centered and P-centered tetrahedra in which all the AlO4 tetrahedra vertices and three of PO4 tetrahedra corners are shared. The framework contains unique 12-membered ring channels, which intersect each other with 12-membered ring windows in three dimensions, and almost spherical cavities, in which water and amine ions are located. The window containing three P=O groups selectively interacts with 4-(2-aminoethyl)diethylenetriamine by the effect of recognition in the hydrothermal condition. The compound could exist up to 260 degrees C. At higher temperature, the amine was decomposed and released, and the compound was transferred into amorphous phase. The component Al of the compound can be partly substituted with other elements, such as Sn, Zn, Mg, Co, Mn, and Cd, by which the charge of the framework can be adjusted. (C) 1999 Academic Press.