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Abstract cis-Diammineplatinum α-pyrrolidone tan cation, [Pt4(NH3)8(C4H6NO)4]6+, is proved to be reduced to dark blue [Pt4(NH3)8(C4H6NO)4]5+ and yellow [Pt4(NH3)8(C4H6NO)4]4+ by water and be oxidized by air to a yellow species of Pt(III). The reduction reaction is accelerated by visible light irradiation. Both the reduction and oxidation reactions are completely reversible and the addition of Ce4+ or Fe2+ quantitatively restores the original species, respectively.
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Kazuko Matsumoto (1984) studied this question.
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