SYNTHESIS AND STRUCTURE DETERMINATION OF (NH4)2TIF4O

The new ammonium oxyfluorotitanate (NH4)2TiF4O was obtained by heating an aqueous solution of H2TiF6 and urea as a pH modifier at 170-degree s-C for 24 hours. The crystal structure was determined by single cryst al X-ray diffraction. The structure is essentially isostructural with beta-(NH4)2FeF5. Nevertheless, the symmetry of (NH4)2TiF4O is monoclin ic,a = 0.63245(1) nm, b = 0.75422 (1) nm, c = 1.10095(2) nm, beta = 90 .12(2)-degrees,space group P2(1)/m, Z=4. The structure consists of kin ked parallel chains of TiF4O2 octahedra linked through the two oxygens in a trans position. The chains are loosely interconnected by the NH4 + cations.