Neptunium dioxide ions

Purex process, 6, 951 Neptunium complexes, 3, 1131-1215 cupferron, 2, 510 Neptunium dioxide ions disproportionation Purex process, 6, 950... 

Purex process, 951 Neptunium(VI) reduction Purex process, 951 Neptunium dioxide ions disproportionation rex process, 950 Nerve growth factor snake venoms zinc, 613... 

With the exception of thorium, the actinides form trihalides. For uranium and neptunium, reduction of the MX4 compounds with hydrogen is necessary, but for the elements from plutonium onwards the action of the carbon tetrahalide or aluminium halide on the dioxide is usually employed. The trifluorides are insoluble but the rest dissolve to give solutions containing ions. 

In the oxidations of edta and oxalic acid by neptunium(vi) in perchloric acid,carbon dioxide is produced. One mole of edta reacts with six moles of Np, the rate being first-order in both reagents with an inverse hydrogen-ion dependence. On mixing the reactants, a distinct colour change is observed which is ascribed to complex formation, the... 

Pyykkd P, Laakkonen LJ, Tatsumi K. REX calculations. 12. Iteration parameters for the 5f-element organometallics of thorium-neptunium. Geometries of thorium dioxide and uranyl ion revisited. Inorg Chem. 1989 28(10) 1801-1805. 

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