A novel C-symmetric propeller-shaped vanadium(IV/V) oxide cluster complex, [VO(4,4'- Bubpy)] (V'), has been synthesized from the reaction of the windmill-shaped vanadium(V) oxide cluster complex [VO(4,4'- Bubpy)] (V) with PPh under N, whereas refluxing V in methanol or ethanol under N provides tetranuclear oxido(alkoxido)vanadium(IV/V) complexes [VO(OR)(4,4'- Bubpy)] [R = Me (V'-Me) and Et (V'-Et)]. The mixed-valent vanadium(IV/V) clusters V' and V' are converted back to V under O. Interconversions of V' and the oxido(alkoxido)vanadium(V) complexes [VO(OMe)(4,4'- Bubpy)] (V) and [VO(OEt)(4,4'- Bubpy)] (V-Et) are also presented.
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