Two oxo-containing neptunium(IV) -butoxides, [NpO(OBu)] () and [KNpO(OBu)] (), were synthesized using the ligand substitution between neptunium(IV) silylamides and HOBu, whereas the salt metathesis between [NpCl(DME)] (DME = dimethoxyethane) and various amounts of LiOBu resulted in the formation of oxo-free alkoxides [Np(OBu)(py)] (; py = pyridine) and [Li(THF)][Np(OBu)] (; THF = tetrahydrofuran). These complexes are the first structurally characterized neptunium(IV) alkoxides using single-crystal X-ray diffraction and solid-state absorption spectroscopy, which provide data for the development of anhydrous metal-organic neptunium chemistry.
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