Neptunium\nPyridine Dipyrrolide Complexes

Two pyridine dipyrrolide neptunium(IV) complexes, (<sup>Mes</sup>PDP<sup>Ph</sup>)NpCl<sub>2</sub>(THF) and Np(<sup>Mes</sup>PDP<sup>Ph</sup>)<sub>2</sub>, where (<sup>Mes</sup>PDP<sup>Ph</sup>)<sup>2–</sup> is the doubly deprotonated form of 2,6-bis(5-(2,4,6-trimethylphenyl)-3-phenyl-1<i>H</i>-pyrrol-2-yl)pyridine, have been prepared. Characterization\nof the complexes has been performed through a combination of solid-\nand solution-state methods, including single-crystal X-ray diffraction\nand electronic absorption and nuclear magnetic resonance spectroscopies.\nCollectively, these data confirm the formation of the mono- and bis-ligated\nspecies. Electrochemistry of a series of bis-ligated actinide complexes,\nAn(<sup>Mes</sup>PDP<sup>Ph</sup>)<sub>2</sub> (An = Th, U, Np), is\npresented.