Syntheses, Characterization and Structural Determination of Nine Coordinated N2H5[Ce(edta)(H2O)3]·4H2O and N2H5[Eu(edta)(H2O)3]·4H2O

Abstract

Hydrazinium complexes of Ce(III) and Eu(III) ethylenediaminetetra-acetate hydrates have been synthesized in aqueous solution and characterized by hydrazine and metal analyses, elemental analysis, infrared spectra, X-ray power diffraction and single crystal X-ray diffraction techniques. The CeIIIN2O7 parts in the complex anion has a pseudomono-capped square antiprismatic nine-coordinate structure, in which the six coordinated atoms (two N and four O) from the ethylenediaminetetraacetate ion and three water molecules are coordinated to the central rare earth metal ion directly. The EuIIIN2O7 part in the complex anion has the same structure as CeIIIN2O7 part. The crystal of the cerium complex belongs to the orthorhombic crystal system and Fdd2 space group. The crystal data are the follows: a = 19.7281(7) A, b = 35.7790(11) A, c = 12.3244(4) A, α = β =γ = 90°, V = 8699.2(5) A3. The final R and Rw are 0.020 and 0.0589 for with I > 2σ (I) and 3,842 reflections, respectively. The crystal of the europium complex is isostructural with the cerium complex. The crystal data of europium complex are: a = 19.7281(7) A, b = 35.7790(11) A, c = 12.3244(4) A, α = β =γ = 90°, V = 8699.2(5) A3. The final R and Rw are 0.0252 and 0.687 for with I > 2σ (I) and 3,842 reflections, respectively. The X-ray powder diffraction patterns and infrared spectra of the complex are super imposable indicating their structural similarity. Hydrazinium complexes of cerium(III) and europium(III) ethylenediaminetetraacetate hydrates have been synthesized and characterized by analytical, spectral, thermal and X-ray studies. The crystal structures of both the complexes have been described.