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Iron(II) carboxylato-hydrazinates: Ferrous fumarato-hydrazinate (FFH), FeC 4 H 2 O 4 ⋅ ⋅2N 2 H 4 ; ferrous succinato-hydrazinate (FSH), FeC 4 H 4 O 4 ⋅ ⋅2N 2 H 4 ; ferrous maleato-hydrazinate (FEH), FeC 4 H 2 O 4 ⋅ ⋅2N 2 H 4 ; ferrous malato-hydrazinate (FLH), FeC 4 H 4 O 5 ⋅ ⋅2N 2 H 4 ; ferrous malonato-hydrazinate (FMH), FeC 3 H 2 O 4 ⋅ ⋅1⋅ ⋅5N 2 H 4 ⋅ ⋅H 2 O; and ferrous tartrato-hydrazinate (FTH), FeC 4 H 4 O 6 ⋅ ⋅N 2 H 4 ⋅ ⋅H 2 O are being synthesized for the first time. These decompose (autocatalytically) in an ordinary atmosphere to mainly γ γ-Fe 2 O 3 , while the unhydrazinated iron(II) carboxylates in air yield α α-Fe 2 O 3 , but the controlled atmosphere of moisture requires for the oxalates to stabilize the metastable γ γ-Fe 2 O 3. The hydrazine released during heating reacts with atmospheric oxygen liberating enormous energy, N 2 H 4 + O 2 → → N 2 + H 2 O; ∆ ∆H 2 O =-621 kJ/mol, which enables to oxidatively decompose the dehydrazinated complex to γ γ-Fe 2 O 3. The reaction products N 2 + H 2 O provide the necessary atmosphere of moisture needed for the stabilization of the metastable oxide. The synthesis, characterization and thermal decomposition (DTA/TG) of the iron(II) carboxylato-hydrazinates are discussed to explain the suitability of γ γ-Fe 2 O 3 in the ferrite synthesis.

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