INFRARED SPECTROSCOPIC STUDIES OF SOME URANYL NITRATE COMPLEXES

Abstract

Abstract The infrared spectra of ammonium, potassium, rubidium and cesium uranyl trinitrates (NH4UO2(NO3)3, KUO2(NO3)3, RbUO2(NO3)3 and CsUO2(NO3)3) have been measured in the region from 4000 cm−1 down to 30 cm−1. A normal coordinate analysis of the complexes has been made as a six-body problem (UO2 X3) (X=NO3) neglecting the outer cations. Force constants of U-O and U-X bonds in UO2X3 anion have been approximately obtained on the basis of a modified valence force field including an additional force constant of opposite U[sbnd]O bond-bond interaction. In addition, bond order of the uranyl bonds of the complexes has been determined from the U[sbnd]O stretching force constants and compared with those of other uranium compounds such as metal uranates and uranium oxides.