Rare earth metal hydrazine

Rare Earth Metal Hydrazine Carboxylate Hydrates... 

When aqueous solutions of rare earth salts are treated with solutions of ammonium carbonate in hydrazine hydrate (N2H5COON2H3), rare earth metal hydrazine carboxylate hydrate complexes are formed [15]. Initially, a precipitate forms that dissolves with the addition of excess reagent. On keeping the solution for a couple of days crystalline solids separate. The crystals are washed with alcohol and then diethyl ether and stored in a vacuum desiccator. The composition of the crystals determined by chemical analysis and infrared spectra has been found to be Ln(N2H3C00)3-3H20 ... 

As the crystal structures of all the rare earth metal hydrazine carboxyl-ates are isomorphous, it is possible to prepare solid solutions of Pr-Ce hydrazine carboxylates. The complexes Cei xPr (N2H3C00)3-3H20, with X = 0-0.5, are prepared by the same procedure used in preparing rare earth metal hydrazine carboxylates as mentioned in Section 4.3.2. Stoichiometric amounts of cerium nitrate and praseodymium nitrate are dissolved in doubly distilled water, and to this a solution of hydrazine carboxylate in hydrazine is added slowly. The mixture is allowed to... 

The first step shows an endothermic peak due to dehydration occurring at a fairly high temperature (—250 °C), indicating the presence of coordinated water. The second and third steps of decomposition, involving dissociation of hydrazine, are both exothermic. Owing to the close similarity in the structure of rare-earth-metal complexes, the observed decomposition temperatures are identical. 

The use of metal nitrates provides a particularly convenient method for doping a host oxide with luminescent ions. Along with the yttrium nitrate, a luminescent rare earth ion such as Eu3+, can be added as a nitrate salt. In addition to yttria, alumina can also be prepared from aluminum nitrate and hydrazine (Ozuna et al., 2004) ... 

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