New hydrazinium complexes of lanthanide (III) with ethylenediaminetetraacetate: Spectral, thermal and XRD studies

Abstract

Diammonium and dihydrazinium salts of ethylenediaminetetraacetate  acid have been prepared by neutralization reaction between ammonia or hydrazine hydrate and H₄ EDTA in 2:1 ratio. Ammonium hydrazinium salt has also been prepared using a mixture of the two bases and the salts have been characterized by chemical analyses, elemental analyses, infrared spectra and thermal studies. Dihydrazinium salt, (N₂H₅)₂ H₂EDTA has been used as a ligand to prepare hydrazinium lanthanum EDTA hydrates. N₂ H₅[Ln(EDTA)(H₂O)₃] (H₂O)₅ (where Ln= La, Ce, Pr, Nd, Sm). These complexes have been characterized by chemical and elemental analyses, conductivity and magnetic moment measurements and electronic and infrared spectral studies. TG and DTA traces indicate that these complexes undergo multi-step degradation to yield respective oxides and Ln₂O₃ as the final residue. The metal analyses, infrared spectra and X-ray powder techniques have been used to confirm the end product.