Metal oxalate hydrazines

The conventional procedure for preparing metal oxalate hydrazine complexes is to treat an aqueous solution of the metal salt with an alcoholic solution of hydrazine hydrate ... [Pg.98]

When an aqueous solution of the metal salt of Fe, Co, and Ni is mixed with ammonium oxalate in hydrazine hydrate, the corresponding metal oxalate hydrazines are precipitated ... [Pg.99]

Mixed metal oxalate hydrazines containing iron as the common metal are prepared either from metal powders or metal salts. Stoichiometric quantities of the respective metal powders are dissolved in a solution of... [Pg.103]

Mixed metal oxalate hydrazines of Mg and Co can also be obtained by the reaction of mixed metal oxalate hydrates MFe2(C204)3-6H20 with excess hydrazine hydrate [16,17]. [Pg.104]

Similar to the above, mixed metal oxalate hydrazines can be prepared with cobalt being the common metal. Stoichiometric quantities of the respective metal powders of magnesium and nickel are dissolved in a solution of ammonium oxalate in hydrazine hydrate. It takes a few hours for the metal powders to completely disperse into the solution. After their complete dissolution, alcohol is added to precipitate out the complex. The precipitate is further washed with alcohol and diethyl ether [18] ... [Pg.104]

The IR spectra of mixed metal oxalate hydrazines confirm the presence of coordinated oxalate and hydrazine groups. The spectra have characteristic absorptions of bidentate oxalate at 1650, 1320, 1300, and... [Pg.104]

The mixed metal oxalate hydrazines exhibit autocatalytic behavior, and the product of combustion is the spinel MFe204. Interestingly, the precursors ignite while undergoing suction filtration if allowed to dry. [Pg.106]

Patil, K.C., Gajapathy, D., and Kishore, K. (1982) Thermal reactivity of metal oxalate hydrazinates. Thermochimica Acta, 52, 113-120. [Pg.130]

Gajapathy, D. and Patil, K.C. (1983) Mixed metal oxalate hydrazinates as compound precursors to spinel ferrites. Materials Chemistry and Physics, 9, 423-438. [Pg.130]

Table 4.7 gives thermal decomposition data of N2H5M(N2H3COO)3-H2O. The iron complex shows a single step in TG-DTG and two exotherms in DTA, while both cobalt and nickel complexes show two-step decomposition in TG-DTG and two exotherms in DTA. The observed weight loss after the first step corresponds to the formation of metal oxalate hydrazine... [Pg.155]

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