Photochemical reductive elimination of [PtIV(NH3)4(NH2)Cl]2 +: Photogeneration of hydrazine

When [PtIV(NH3)5Cl]3 + is deprotonated the complex [PtIV(NH3)4(NH2)Cl]2 + is formed. Upon NH2− → PtIV LMCT excitation (λirr > 250 nm) a reductive elimination takes place: [PtIV(NH3)4(NH2)Cl]2 + → [PtII(NH3)3Cl]+ + N2H4 + H+. Since Pt(II) ammine complexes can be reoxidized to Pt(IV) by H2O2 it is suggested that in a cyclic process the overall reaction could proceed according to the equation: 2 NH3 + H2O2 → N2H4 + 2 H2O.