SYNTHESIS, SPECTROSCOPIC AND MAGNETIC-PROPERTIES OF TETRAMETHYLAMMONIUM HEXACHLOROURANATE(III), [(CH3)(4)N]3UCL6

The synthesis of tetramethylammonium hexachlorouranate(III) together w ith some of its structural and spectroscopic and magnetic properties i s reported. The compound crystallizes in the tetragonal system with a= 13.020 Angstrom, c=7.825 Angstrom, Z=2 and V=1376.48 Angstrom(3). The electronic absorption, Raman and infrared spectra hale been recorded a nd are discussed. Magnetic susceptibilities of polycrystalline samples were measured by the Faraday method in the 6.2-300 K range. [(CH3)(4) N]3UCl6 follows the Curie-Weiss law in the 200-300 K range with C=1.50 58 emu . K . mol(-1), Theta=17 K and mu(eff)= 3.36 B.M. At lower tempe ratures the plot shows an antiferromagnetic transition at 4.8 K.