Abstract
The reaction of metallic uranium, or uranium oxides, with solutions of alkyammonium nitrates in liquid dinitrogen tetroxide is a satisfactory and rapid method for the preparation of alkylammonium uranyl nitrates UO/sub 2/(NO/sub 3/)/ sub 2/, MNO/sub 3/ or UO/sub 2/(NO/sub 3/)/sub 2/, 2MNO/sub 3/ (where M is EtNH/ sub 3/, Et/sub 2/NH i, Et/sub 3/NH, or Et/sub 4/N). With ethylammonium nitrate, both com pounds can be prepared. With di- and tri-ethylammonium nitrate only the 1: 1 compound is isolated; a mixture of the two compounds is obtained with tetraethylammonium nitrate. In the reactions with metallic uranium, uranium(IV) compounds are formed as intermediates and have a greater stability in these solutions than in dinitrogen tetroxide alone. Solutions of the 1: 1 compounds in nitromethane were studied by the methods of electrolysis, conductometric titration, light absorption, molecular weight, and ultraviolet spectra, and shown to contain the STAUO/sub 2/(NO/sub 3/)/sub 3/!/sup -/ ion. Solutions of the 1: 2 compounds also contain this anion, and no evidence was found for the existence of the ion STAUO/sub 2/(NO/sub 3/)/sub 4/!/sup 2 / ->s in non-aqueous solvents. Some rates of reaction of uranium with alkylammonium nitrate solutions are recorded. (auth)
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