VIBRATIONAL ASSIGNMENTS OF CRYSTALLINE WATERS IN SOME URANYL HALIDE-COMPLEXES

To establish the vibrational assignments of the bands near 450 and 320 cm-1 in the hydrated uranyl halide complexes, M2UO2X4·nH2O (M = Na, K, Rb, Cs, NH4; X = Cl, Br)m, their IR spectra have been measured in the region from 500 to 200 cm-1 and investigated in some detail by making use of deuteration effect. The results show that the former band is evidently assigned to water libration (wagging vibration) and the latter to MO stretching vibration. Some possible structure of water coordination in the hydrated complexes is estimated on the basis of the spectral results. © 1979.