Fig. 3. The actinide L3-edge XANES spectra from An[(tBuNO)py]4 [An = Pu (1), bottom; Np (2), top]. Data were compared with oxidation state references, (PPh4)2[NpVIO2Cl4], AnIVCl4(DME)2 (An = Np, Pu), PuIIII3(NC5H5)4, and an aqueous sample of PuVIO22+ dissolved in HNO3(aq) (1 M) that contained (NH4)2[Ce(NO3)6] to hold the Pu oxidation state at +6.
