[en] The nonaqueous chemistry of trivalent neptunium and plutonium has been shown to closely mimic that of uranium(III). The organic-soluble actinide triiodide complexes AnI₃(THF)₄ (An = Np, Pu) are convenient precursors to a host of new transuranic complexes. Examples of new trivalent, homoleptic Np and Pu transuranic complexes include the previously reported coordinatively unsaturated tris(silylamides), An[N(SiMe₃)₂]₃, and the tris(aryloxides), An[0-2,6-(t-C₄H₉)₂C₆H₃]₃. Continued efforts in the syntheses and characterization by NMR, UV/Vis/NIR, and IR spectroscopy of new Np and Pu organometallic and alkoxide complexes are discussed