Synthesis metal hydrazine carboxylate

Several nanocrystalhne metal oxides have been prepared by the combustion method and the topic has been reviewed by Patil et al. [5]. Combustion of metal hydrazine carboxylates, [e.g. MCjO (N H )J is generally anployed to obtain the nanoparticles of oxides such as y-Fefiy ZnO and NiO. Mixed-metal oxides like cobaltites (MCo O ), ferrites (MFe,0 ), manganites (MMn O ) and titanates (MTiOj) are prepared by the combustion of mixed-metal carboxylate hydrazinates in the temperature range of 165-345 °C [6,7]. Solution combustion synthesis has been used to prepare nanocrystalline oxides such as Al Oj, CeO, ZrO, TiO, ... 

Patil, K.C. and Seker, M.M.A. (1994) Synthesis, structure and reactivity of metal hydrazine carboxylates combustible precursors to fine particle oxide materials. International Journal of Self-Propagating High-Temperature Synthesis, 3, 181-196. 

The complexes crystallize in a few hours to a few days. Interestingly, as the products are formed from the process of crystallization, they are single crystals of high purity. This chapter describes the synthesis, infrared spectra, electronic spectra, and thermal reactivity of several simple and mixed metal hydrazine carboxylate complexes prepared by this method. 

The hydrazinium nickel hydrazine carboxylate complex, (N2H5)Ni (N2H3C00)3-H20, is also used as precursor for the synthesis of metallic Ni in the sonochemical preparation of Ni-Mo-S/Al203, since volatile Ni precursors such as Ni(CO)4 are exceptionally toxic and dangerous to use [24]. Similarly, copper hydrazine carboxylate is used to prepare nanoparticles of copper by the sonication method [25]. The presence of a zwitterionic surfactant in the synthesis procedure causes the formation of elongated nanoparticles of aspect ratio 10, which is of significance for electrical applications. In the absence of the zwitterionic surfactant only spherical particles result [26]. 

Analogous to the synthesis method adopted for the preparation of hydrazinium metal sulfite hydrates, hydrazinium lanthanide sulfite hydrates, N2H5Ln(S03)2(H20)2, can be synthesized by the addition of hydrazine sulfite monohydrate to the respective anhydrous lanthanide hydrazine carboxylates M(N2H3COO)2 [10]. 

Premkumar, T. (2002) Synthesis and structural, spectroscopic, and thermal characterization of pyrazine, pyrazole and imidazole carboxylates of metal with hydrazine, Ph.D Thesis, Bharathiar University, Coimbatore, India. 

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