Hydrazinium metal hydrazine

HYDRAZINIUM METAL HYDRAZINE CARBOXYLATE HYDRATES -N2H5M(N2H3C00)3 H2O... 

SOLID SOLUTIONS OF HYDRAZINIUM METAL HYDRAZINE CARBOXYLATE HYDRATES - N2H5 Mv (Co/Ee/Mn)22 (N2H3COO)3 H2O... 

Table 4.8 Unit cell dimensions for the monoclinic hydrazinium metal hydrazine carboxylate hydrates and their solid solutions.

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. 

As a ligand CO2 converter Hydrazine and hydrazinium metal complexes... 

Inorganic derivatives of hydrazine Hydrazine salts and metal hydrazine complexes of perchlorate, nitrate, azide, hydrazinium nitroformate, or azide Hydrazinium azide... 

The synthesis of metal hydrazine complexes with thiocyanate or isothiocyanate as anions can be carried out by the following methods [8]. In the first case, stoichiometric quantities of metal(II) salts like chlorides or sulfates of Mn, Fe, Co, Ni, Zn, and Cd in an alcohol-water mixture (1 1 by volume) are added to hydrazinium thiocyanate. The latter is metathet-ically formed by the reaction of NH4SCN -I- N2H4 H2O (1 1 mole ratio) (Chapter 2) ... 

Govindarajan, S., Babu, P.J., and Patil, K.C. (1986) Thermal analysis of metal sulfate hydrazinates and hydrazinium metal sulfates. Thermochimica Acta, 97, 287-293. 

Premkumar, T. and Govindrajan, S. (2002) The chemistry of hydrazine derivatives -thermal behaviour of hydrazinium salts and metal hydrazine complexes of 4,5-imidazole dicarboxylic acid. Thermochimica Acta, 386, 35-42. 

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. 

Hydrazinium metal sulfate hydrazines of the formula (N2H5)2M(S04)2-3N2H4 are prepared by reaction of the corresponding ammonium metal sulfate hexahydrates with stoichiometric amounts of hydrazine hydrate ... 

The reaction is instantaneous with the evolution of ammonia and color change. After complete removal of ammonia, the products are washed with ethanol and diethyl ether, and dried over P2O5. However, the above reaction with Mn gives only the hydrazinium metal sulfate (N2H5)2Mn(S04)2 and not the hydrazinium metal sulfate hydrazine as expected. The corresponding hydrazinium metal sulfate hydrazine of copper is also not obtained because of its instant reduction to copper metal on addition of hydrazine hydrate. 

Table 5.1 Infrared absorption frequencies (cm of hydrazinium metal sulfates and hydrazinium metal sulfate hydrazines.

Although thiocyanate with neutral amines (bases) has been investigated intensively with transition metals, knowledge of the respective thiocyanates with cationic amines is very limited and, in particular, with the hydrazinium cation is almost unknown. The absence of reports on the hydrazinium metal complexes of thiocyanates is not surprising as the usual method of preparation from aqueous solutions of the metal thiocyanates and hydrazinium thiocyanate always yields metal thiocyanate hydrazines. The first examples in which the hydrazinium cations are coordinated to the metal in the cis... 

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... 

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]. 

Hydrazinium metal pyruvates [N2H5]2M[CH3COCOO]4, where M = Co or Ni, are prepared from aqueous solution containing a mixture of the respective salts, pyruvic acid, and hydrazine hydrate [11]. The magnetic moments and electronic spectra of the complexes suggest a high-spin... 

Raju, B. and Sivasankar, B.N. (2009) Spectral, thermal, and X-ray studies on some new bis and tris-hydrazine and hydrazinium metal pyruvates. Journal of Thermal Analysis and Calorimetry, 98, 371-376. 

Patil, K.C., Govindarajan, S., Soundararajan, R., and Pai Verneker, V.R. (1981) Thermal analysis of hydrazinium metal sulfates and their hydrazinates. Proceedings of the Indian Academy of Sciences - Chemical Sciences, 90, 421 26. 

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