Neptunium(5) compounds with some acetic acid derivatives. Synthesis and properties

Conditions for formation of neptunium(4) salts with aminoacetic, glycolic and trichloroacetic acids are studied. Crystal NpO2CH2OHCOOxH2O (1) and NpO2CCl3COOxH2O (2) are synthesized. Crystal lattice parameters are defined. IR and electron spectra are taken off. The electron absorption spectra of (1) and (2) compounds indicate the shift of the NpO+ (980 nm) ion basic characteristic band into the long-wave range equalling 16 and 21 nm correspondingly. This fact makes it possible to assume the presence of cation-cation interaction in the crystals. The (1) compound looses water within the interval of 200-350 deg C with simultaneous decomposition up to NpO2. The (2) compound transforms by the temperature of 211 deg C into an intermediate product NpOCl2, which thereafter decays up to NpO2. 14 refs.; 3 figs