IR, X-Ray and Ultrasonic Velocity of Uranyl (II) Stearate

The infrared and X-ray diffraction techniques have been used to study the structure of uranyl (II) stearate in solid state, whereas the structural changes of the metal soap in the solvent-mixture of 50% dimethylformamide and 50% benzene(V/V) at 40°C have been studied by the ultrasonic method. The appearance of two absorption bands at 1570 and 1440 cm^-1 which may be assigned to as υ_as COO^- and υ_s COO^- modes of carboxylate group of uranyl stearate indicate the ionic nature of this group in the soap. The XRD analysis reveals that uranyl soap has a single layer structure as proposed by vold and Hattiangdi for disoaps. Ultrasonic velocity measurement is employed to obtain various acoustic parameters and the critical micelle concentration, CMC(5.55×10^-4 mol. dm^-3) for the soap solutions. The values of ultrasonic velocity and acoustic impedance are found to decrease while adiabatic compressibility and intermolecular free length increase with increasing soap concentration.