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Title: New nine coordinated hydrated heavier lanthanide ethylenediaminetetraacetates containing hydrazinium cation: Crystal structure of N₂H₅[Dy(EDTA)(H₂O) ₃](H₂O)₅
Authors: Vikram, L
Sivasankar, B N
Issue Date: Jan-2008
Publisher: CSIR
IPC Code: Int. Cl. ⁸ C07F5/00
Abstract: Some new nine coordinated hydrazinium lanthanide ethylenediaminetetraacetate hydrates N₂H₅[Ln(EDTA)(H₂O) ₃](H₂O)₅ where Ln: Eu, Gd, Tb or Dy, have been prepared in aqueous media and characterized by chemical and elemental analyses, conductance, magnetic and spectral studies. The X-ray powder diffraction spectra of the complexes exhibit isomorphism in the series. The dysprosium complex has been prepared as a single crystal suitable for X-ray single crystal study and its analysis shows that the metal ion is nine coordinated with hexadentate tetravalent EDTA₄⁻ while three more coordination sites are occupied by water molecules. The simultaneous TG-DTA profiles of the complexes show multi step degradation involving dehydration, ligand pyrolysis and formation of respective metal oxides as end residues. The first stage of degradation provides clear evidence for the removal of five non-coordinated water molecules. The final residues have been identified and confirmed by TG-weight loss and X-ray powder diffraction technique.
Page(s): 25-31
ISSN: 0376-4710
Appears in Collections:IJC-A Vol.47A(01) [January 2008]

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