A number of simple and complex hydrazinium derivatives have been prepared by the reaction of hydrazine hydrate with ammonium salts. The products were characterized by chemical analysis and infrared spectra.

Hydrazinium acetate, metavanadate, sulfite, sulphamate and thiocyanate have been prepared by the reaction of corresponding ammonium salts with hydrazine hydrate. The compounds were characterised by chemical analysis and infrared spectra. Thermal behaviour of these hydrazinium derivatives have been investigated using thermogravimetry and differential thermal analysis.

Thermal analysis of hydrazinium metal sulphates, (N₂H₅)₂ M(SO₄)-I, and their hydrazinates, (N₂H₅)₂−M(SO₄)₂3N₂H₄−II, whereM=Fe, Co and Ni have been investigated using thermogravimetry and differential thermal analysis. Type II compounds on heating decompose through an intermediate I and metal suphlate to the respective metal oxides.

Complexes of the type [M(N₂H₄)₂(NCS)₂], where M = Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cd(II) and Mg(II) have been prepared and characterized by chemical analysis. infrared and Mössbauer spectroscopy and magnetic moments. Hydrazine acts as a bridge between the two metal ions through the N-atom forming a distorted octahedral environment around the metal ion. Thermal decomposition of the complexes was studied in air and nitrogen atmosphere usingtg anddta techniques. The thermal stability of the complexes in nitrogen and the M-N stretching frequencies of M-NCS and M-N₂H₄ obey Irwing-Williams order for the bivalent metal complexesi. e. Mn²⁺<Fe²⁺<Co²⁺<Ni²⁺>Zn²⁺>Cd²⁺

The reaction of hydrazinocarboxylic acid, N₂H₃COOH, with metal ions in the presence of hydrazine hydrate yields metal hydrazinocarboxylate derivaties like: M(N₂H₃COO)₂·nH₂O, M=Mg, Ca and Mn; M (N₂H₃COO)₂(N₂H₄)₂, M=Mn, Fe, Co, Ni and Zn; N₂H₅M (N₂H₃COO)₃·H₂O, M=Fe, Co, Ni, Zn; and N₂H₅Mg(N₂H₃COO)₃. Reaction conditions to obtain a desired product have been standardised and a probable reaction mechanism for the formation of different products proposed. Thermal analysis of the compounds has been investigated using simultaneous TG-DTG-DTA. Metal hydrazinocarboxylate derivatives decompose in air at low temperatures to the respective metal oxides.

Metal-hydrazine complexes, [M(N₂H₄)_n]²⁻ (M=Mn, Fe, Co, Ni, Zn and Cd,n=2 or 3) with different anions like sulphate, sulphite, acetate, formate, oxalate, hydrazinocarboxylate, nitrate and perchlorate have been investigated as precursors to oxide materials. The thermal reactivity of these complexes changes dramatically with the anion, e.g. sulphate, sulphite, acetate and formate complexes—decompose; oxalate and hydrazinocarboxylates—deflagerate and nitrate and perchiorate complexes—detonate. The deflagerating nature of the metal-hydrazine oxalates and hydrazinocarboxylates has been employed in the combustion synthesis of fine particle γ-Fe₂O₃, Fe₃O₄, ferrites and cobaltites at low temperature.

The kinetics of heterogeneous decomposition of hydrogen peroxide on fine particle ferrites, MFe₂O₄ and cobaltites, MCo₂O₄, where M=Mn, Fe, Co, Ni, Zn and Mg, have been investigated. The decomposition of H₂O₂ was found to be first order at low concentration (0·3%) and zero order at high concentration (30%) of H₂O₂. The catalytic activity of cobaltites on the decomposition of H₂O₂ is found to be better than ferrites. The observed catalytic behaviour of ferrites and cobaltites has been attributed to their fine particle nature, large surface area and electronic structure.

The crystal structure of dihydrazinium uranyl dioxalate monohydrate, (N₂H₅)₂ [UO₂(C₂O₄)₂(H₂O)], has been determined by x-ray diffraction. The structure was solved by heavy-atom method and refined to an R value of 0–059 using 2312 reflections. The N₂H₅⁺ ions are not coordinated to the metal. In the anion [UO₂(C₂O₄)₂(H₂O)]²⁻, the linear UO₂²⁺ group is coordinated by two chelating bidentate oxalate oxygens and a water oxygen. The coordination polyhedron around the uranium atom is an approximate pentagonal bipyramid.