Abstract: | The title MnIV complex, Mn(LH2)3]4+ (LH2 = biguanide = H2NC(NH)NHC(NH)NH2), an authentic two‐electron oxidant, quantitatively oxidizes hydrazine (H2NNH2) to dinitrogen in the pH interval 2.00–3.50. The net four‐electron oxidation of hydrazine is provided by two MnIV as established by stoichiometric studies. The overall reaction is composed of two parallel paths: |