Hydrazinium metal complexes

Inorganic Hydrazine Derivatives Synthesis, Properties and Applications, First Edition. Edited by K. C. Patil and Tanu Mimani Rattan. 

The sulfate ion (S04 ), though a simple dianionic ligand, exhibits a rather flexible symmetry and variable mode of binding with metal ions in the crystalline state. Interest in metal sulfate interactions with the hydra-zinium cation arises from the fact that these compounds exhibit one- and three-dimensional magnetic interactions of a linear-chain antiferromag-net. Dihydrazinium sulfate forms a series of double sulfates with divalent and trivalent cation that are well crystallized and, in a few instances, are even less soluble than hydrazinium sulfate itself. The most easily prepared double sulfates are those of Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, Li, Mg, Al, La, Ce, Pr, Nd, and Sm. These salts are similar to the ammonium alums obtained with some metal sulfates. In contrast to the ammonium double salts, the hydrazinium metal sulfates of first row transition elements and lithium crystallize without water, whereas the lighter lanthanides and aluminum form hydrated salts. 

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

Generally, hydrazinium metal complexes are prepared by the variation of any one of the following methods ... 

Table 1.8 Crystal data and N—N bond distances in hydrazinium metal complexes.

The reactivity and bonding of these hydrazinium metal complexes is significantly important from the point of view of their applications. 

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... 

In the last decade, several new hydrazinium metal complexes have been prepared and their spectra, thermal properties, and crystal structures reported [3-12]. Some of them are briefly reviewed here. 

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