Abstract

Stabilization of oxidation states (OSs) for transition elements is considered. Distinctions between methods for stabilizing OSs in compounds in solution and in a solid state are discussed. The factors influencing stabilization are elucidated. Generation of high OSs of metals in alkali solutions is noticed. The specifics of stabilization of high OSs in solid compounds, including those in which mixed-valence effects are observed, and in solid matrix systems, in particular, in perovskite-related ones, are discussed. New data are cited concerning the stabilization of metal OSs in trans-dioxo complexes [MO2L4] 2 , where M = Mo, Tc, Ru, W, Re, or Os; and in the paramagnetic clusters that were discovered in neutral tungstates and hydroxo complexes of Rh, Ir, Pt, Pu, or Fe, and other elements in unusual high OSs.

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