Fig. 4. (a) U LIII-edge XANES plots of complexes 118C6·4THF, 1THF and U(iii)–U(vi) standards. White line energies denoted by diamonds with edge (inflection point) energies denoted by triangles. Dashed line indicates edge energy of the U(iv) standard. Estimated uncertainty ±0.2 eV. (b) Plot of XANES edge energies versus uranium oxidation states. The dotted line indicates the linear regression fit used to calculate oxidation state numbers for 118C6 (green triangle) and 1THF (red square).
