Energy for the first inflection point in the actinide L3-edge XANES spectra from AnIV[(tBuNO)py]4 (An = Pu, 1; Np, 2). Data were compared with oxidation state references, namely (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.
| Compound | Inflection point (eV) | Δ inflection point (analyte – AnVIO22+) (eV) |
|---|---|---|
| (PPh4)2[NpVIO2Cl4] | 17 615.7 | −0.0 |
| NpIV[(tBuNO)py]4 (2) | 17 614.8 | −0.9 |
| NpIVCl4(DME)2 | 17 613.9 | −1.9 |
| PuVIO2(aq) (HNO3, 2 M) | 18 063.6 | −0.0 |
| PuIV[(tBuNO)py]4 (1) | 18 062.0 | −1.6 |
| PuIVCl4(DME)2 | 18 059.3 | −4.3 |
| PuIIII3(NC5H4)4 | 18 058.3 | −5.3 |