Plutonyl

Pu(N03 ) -5H2 0 deep red plutonyl nitrate hexahydrate [19125-90-7], Pu02(N03 )2-6H2 0 coral red anhydrous plutonium(IV) sulfate [13692-89-2], Pu(S0 2i pinh or redPu(S0 2 4H20 and moss green plutonyl carbonate/ P2P2-/(9-P/, PUO2CO2 (30). 

Balance the equation for the reaction between permanganate, MnO faqj, and plutonium(III), Pu+Yagj, to form manganous, Mn+2(ag), and plutonyl ion, PuO faq), in acid solution. 

In the literature (2), the possible formation of plutonyl bicarbonate complex is discussed. In order to verify whether we are dealing with bicarbonate or carbonate complexes, the Pu(IV) solutions prepared in NaHC03 and Na2C03 solutions are examined by spectrophotometry. The absorption spectra measured up to 900 nm show no visible difference for both solutions. For this reason it is believed that the Pu(IV) ion forms carbonate complexes irrespective of carbonate or bicarbonate ions present in solution. 

The Crystal Structure of Sodium Plutonyl and Sodium Neptunyl Acetates. 

Extraction (PUREX) liquid-liquid extraction process, 19 674-675 25 420. See also PUREX flow sheet Plutonyl nitrate hexahydrate, 19 691 Plywood, 26 752... 

Unlike the lanthanides, the actinides U, Np, Pu, and Am have a tendency to form linear actinyl dioxo cations with formula MeO and/or Me02. All these ions are paramagnetic except UO and they all have a non-spherical distribution of their unpaired electronic spins. Hence their electronic relaxation rates are expected to be very fast and their relaxivities, quite low. However, two ions, namely NpO and PuOl", stand out because of their unusual relaxation properties. This chapter will be essentially devoted to these ions that are both 5/. Some comments will be included later about UOi (5/°) and NpOi (5/ ). One should note here that there is some confusion in the literature about the nomenclature of the actinyl cations. The yl ending of plutonyl is often used indiscriminately for PuO and PuOl and the name neptunyl is applied to both NpO and NpOi. For instance, SciFinder Scholar" makes no difference between yl compounds in different oxidation states. Here, the names neptunyl and plutonyl designate two ions of the same 5f electronic structure but of different electric charge and... 

Measurements on single crystals of lower symmetry doped with NpO or PuOl" " should remove this uncertainty but no such experiment has been performed so far. However, the distinction between configurations (a) and (b) has been possible in an electron paramagnetic resonance study at 20 K on a single uniaxial crystal of RbU02(N03)3 doped with plutonyl ions. This study conclusively showed that the ground state is H4 with gy = 5.4 and g = 0 28). 

It should be noted here that the variable temperature data presented for Np02 in Fig. 6 are close to those reported by Glebov et al. (43) but that the relaxivities presented in this figure for PuOl are different from those published by these authors (44) (the concentration of the PuO is uncertain in this reference). It has already been mentioned that special care must be taken in the preparation of solutions of plutonyl salts to avoid the presence of lower oxidation states. UV-visible spectroscopy (27) and liquid scintillation detectors (50) are particularly useful to assess the concentration and the nature of Pu species in solution. The purity of the PuO can also be tested by liquid liquid extraction with thenoyltrifluoroacetone, an agent known to be able to extract Pu" " from acidic aqueous phases but unable to extract PuO + (51). 

Hexavalent plutonium, Pu(VI), is relatively stable in aqueous solution and exists as the oxyion plutonyl, Pu022+ (40). The chemical properties of Pu(VI) compounds are somewhat similar to those of U(VI). 

In contrast, the solubilities of the neptunyl species were increased by HEDTA and unexpectedly decreased by EDTA. Plutonyl(V) solubility was not affected by HEDTA or EDTA. The component most significant to neptunium solubility was NaNOz. Sodium nitrite apparently decreased neptunium solubility by reducing the more soluble neptunyl(VI) to the less soluble (V) state. The existence of two oxidation states complicated interpretation of the neptunium data. Sodium carbonate, phosphate, aluminate, and sulfate all increased neptunium solubility, probably through complexation. Separation of the data... 

Neptunyl fluoride (Np02F2) is a pink solid prepared by the reaction of the hydrated trioxide with gaseous HF and by direct fluorination of Np205 at 350°C or NpC>3 H20 at 225°C (208, 220). Plutonyl fluoride (Pu02F2) is prepared by the hydrolysis of PuF6 in aqueous solution (272) or in moist air (273) and by the reaction of Pu02Cl2 with anhydrous HF (274). It is a white solid, isomorphous with U02F2 and forms the dihydrate readily. 

Low coordination numbers also occur with ions of high valency such as the uranyl ion [U02]2+ and the corresponding neptunyl and plutonyl ions here there is also no question of an ionic bond. 

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