Uranyl peroxide

Uranium dioxide peroxide

Fixed

Decomposition> 200 ° C

Risk

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Uranyl peroxide is a chemical compound of uranium and oxygen and is one of the peroxides. It is included in the form of its hydrate in the mineral studtite. Generally uranyl peroxide from a solution of uranium ( VI) by the addition of a peroxide, are usually hydrogen peroxide solution obtained. The crystal structure of the tetrahydrate is comprised of UO22 ions, to which two molecules of water and peroxide are two O22 -coordinated. The peroxide ions act here as μ2 ligands connect the two uranium atoms " edge-on ". The additional crystal water molecules are bound by hydrogen bonds to the Uranylperoxidketten. The tetrahydrate is so far the only pure uranyl peroxide, which has been structurally characterized by X-ray diffraction. Using the density functional theory, however, a structural model for the dihydrate could be obtained, which agrees well with previously published X-ray diffraction data.

More recently, the synthesis of Peroxouranaten succeeded in the cage have complex structures that are similar to the fullerenes in topology. These can be obtained from uranyl nitrate, hydrogen peroxide and an alkali metal hydroxide in aqueous solution; are usually organic molecules - for example, amines - added. This probably have a Templatfunktion, similar to the representation of the zeolite. Based on the synthesis conditions are in these Peroxouranverbindungen not pure Uranylperoxide because they contain depending on the method of synthesis of foreign ions such as Li and organic molecules, which can not be always detected by the method used in the structure determination.

In Potassium / uranyl / oxalate / peroxide can be built up gradually by varying the reaction conditions similar structures.

The detailed investigation of the uranium / peroxide system in recent years is motivated by the observation that can form hydrogen by radiolysis in aqueous solution and knowledge of the chemical behavior of uranium and other actinides in the presence of peroxide for the storage of radioactive waste are relevant.

The specific activity of freshly generated from uranyl peroxide earthly natural uranium is 19930 Bq / g

Formed by dimers of uranyl peroxide bridges in K6 (H2O) 4 [ (UO2 ) 2 ( O2) ( C2O4 ) 4]

Pentagonale Oxalatoperoxouranatgruppe in K10 [( UO2) ( C2O4 ) ] 5 (H2O) 13