Hydrothermal synthesis and characterization of new aluminophos-phates with AlPO_4-15 framework: A_(1.5)[Al_2P_2O_(8.5)(OH)_(0.5)(H_2O)]._xH_2O (A = K or Rb)

摘要

Two new isostructural aluminophosphates, A_(1.5)[Al_2P_2O_(8.5)(H_2O)]._xH_2O (A = K or Rb) have been synthesized hydrothermally and characterized by powder X-ray diffraction, infrared and solid state NMR spectroscopy and thermal analysis. The structure of the potassium compound has been determined by single crystal X-ray diffraction. The structure of its three-dimensional anionic framework is similar to that of AlPO_4-15 with intersecting tunnels occupied by A~+ ions and water of crystallization.