Hydrazinium metal complexes carboxylates

The reaction between metal thiocyanates and hydrazinium thiocyanates cannot be used to prepare hydrazinium metal thiocyanate complexes. Consequently, an alternate method is employed, namely, the decomposition of hydrazinium metal hydrazine carboxylates with dilute thiocyanic acid (<5%) [27,28]. Hydrazinium metal hydrazine carboxylates complexes N2H5M(N2H3C00)3 H20, where M = Co and Ni, are prepared from metal nitrates, sulfates, or chlorides and hydrazine hydrate saturated with carbon dioxide. The dilute thiocyanic acid is prepared by adding barium thiocyanate trihydrate to dilute sulfuric acid. 

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]. 

The combustion of mixed metal iron complexes is similar to that observed for hydrazinium metal iron hydrazine carboxylates. The combustion is autocatalytic, once ignited, and leaves behind voluminous mixed ferrites. The particulate properties of these oxides such as cobal-tites, ferrites and mixed ferrites have been investigated [32]. 

Quite recently, a soUd solution of hydrazinium mixed metal hydrazine carboxylate complex of the type (N2H5)Nio.5Coo.5(N2H3COO)3-H20 has been prepared by mixing the respective metal solutions in a molar ratio of 1 1 [4]. To this solution hydrazine carboxylic acid is added until... 

Hydrazinium mixed metal hydrazine carboxylate complexes of Ni and Co act as a precursor to a bimetallic nano-size powder of Nio.5Coo.5. Overall, it is inferred that metal hydrazine carboxylate derivatives are potential precursors for generating nanocrystalline structures. 

Similar to hydrazinium metal sulfates, hydrazinium metal sulfite complexes can be synthesized the procedure is, though, slightly different. Hydrazinium transition metal sulfite dihydrate complexes of the formula (N2H5)2M(S03)2(H20)2 where M = Fe, Co, Ni, Cu, and Zn are prepared from metal hydrazine carboxylates (described in Chapter 4) as the starting material. In this method, the anhydrous metal hydrazine carboxylate, M(N2H3C00)2, is added to distilled water previously saturated with sulfur dioxide gas. The complex decomposes with the liberation of carbon... 

In addition to the anions listed under HPIC anionic sur ctants, metal-cyanide complexes, aromatic carboxylic acids In addition to the cations listed under HPIC aliphatic and aromatic amines, quaternary ammonium compounds, cationic sur ctants, sulfonium compounds, phosphonium compounds, hydrazinium compounds... 

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