Synthesis and structural characterization of a new layered gallium phosphate using triethylenetetramine as structure-directing agent

摘要

A new layered gallium phosphate Ga_(10)(PO_4)_2(HPO_4)_(12)(OH)_5-2.5N_4C_6H_(20)-4.5H_2O was hydrothermally synthesized at 180 deg C for 3 days by using triethylenetetramine (teta) as structure-directing agent. Its structure was determined by single-crystal X-ray diffraction with a triclinic cell in the space group P-1 (n deg 2) with a = 8.4718(1) A, b = 18.5915(1) A, c = 24.1994(3) A, a = 110.538(1)deg, beta = 93.656(1)deg, gamma = 93.549(1)deg and V = 3547.45(6) A . It consists of [Ga_(10)(PO_4)_2(HPO_4)_(12)(OH)_5] macroanionic sheets composed of infinite chains of GaO_4(OH)_2 octahedra connected via corner-sharing to PO_4 and GaO_4 tetrahedra. They contain four-, seven- and nine-membered rings. The inorganic layers are held together through hydrogen bond between the terminal P-O bondings, the water molecules and the terminal ammonium groups of the intercalated teta molecules.