1. Structural Chemistry of Inorganic Actinide Compounds;Andreev,2007
2. Interaction of Transuranium Elements with Biologically Important Molecules: Structural and Spectroscopic Study of Np(V) Complexes with Imidazole
3. Ring Nitrogen and Key Biomolecules;Brown,1998
4. Hexavalent neptunium-237 stock solution NpO2(NO3)2 was prepared by a technique that included anion-exchange purification from possible inorganic admixtures followed by precipitation of the oxalate of tetravalent Np in order to avoid any organics. Dissolution and destruction of the oxalate complex were carried out in concentrated nitric acid, then the solution was evaporated up to wet salts and dissolved in distilled water. The reduction of hexavalent to pentavalent neptunium was performed by adding NaNO2 solution (2M). Then an excess of concentrated NH4OH was added to precipitate NpO2OH. The precipitate was centrifugated and washed by distilled water five times.
5. Crystal data for: monoclinic, space group P21/c, a=11.2404(5)Å, b=5.6451(2)Å, c=16.9293(8)Å, β=99.369(2)°, V=1059.89(8)Å3, Z=4, 2θmax=65°, R=0.032, wR2=0.058.