INFRARED SPECTROSCOPIC STUDIES OF SOME URANYL NITRATE COMPLEXES

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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.