Metal hydrazines monodentate

In all these complexes the N—N bond length is found to range between 1.45 and 1.48 A, which is the same as in hydrazine or complexes containing monodentate hydrazine. Hydrazine is also present as a mono-dentate ligand in metal hydrazine carboxylate hydrazine complexes [25]. 

Thiosemicarbazides (TSC) and thiosemicarbazones generally react with transition metal ions to form chelate complexes by bonding through both the sulfur and the hydrazinic nitrogen atoms. With silver(I) however, they appear to behave as monodentate ligands and bond through the sulfur atom only.436... 

The coordination chemistry of hydrazine is of interest because of its ability to serve as an electron-pair donor. The presence of two free-electron pairs, as in other polybasic ligands, offers the possibility of several different types of coordination toward transition metal ions. The two free-electron pairs allow it to function as a monodentate, bidentate, or bridging ligand, which make hydrazine a preferred ligand. Hydrazine may act both as a ligand or a redox reagent in reactions with transition metals to form complexes. In a comprehensive review by Bottomley, the reaction between hydrazine and transition metals has been investigated in detail and summarized [21]. 

Transition metal complexes containing monodentate and bridging hydrazines are well known. The complexes of transition metal salts of divalent metals like Co " " and Ni + with anions such as Cl , N02, NOs , S04 , C103, and C104, with 1,2, or 3 coordinated molecules... 

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