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The reaction of the ligands ,ethylenediaminetetraacetic acid terasodium salt (Na4 EDTA) and N—N heterocyclic diamines like2 ,2'-bipyridine (bipy) with iron(Ⅱ) sulfate with 1:2:2 stoichiometric ratios form the mononuclear ternary complex of formulae ,[Fe2 (EDTA)(bipy)2 ] at pH～7 .The FTIR and Raman laser spectra of the iron(Ⅱ) complex show that 2 ,2'-bipyridine is present asa bidentate ligand and the ethylenedia-minetetraacetic acid terasodium salt as monodentate carboxylate anion .The electronic spectra and magnetic moments data suggest the six coordination number .It has two iron(Ⅱ) centers in octahedral environments , which are interlinked by carboxylato-O atoms of ethylenediaminetetraacetate and by nitrogen atoms of the two 2 ,2-bipyridine ligands in a chelating mode .Thermal analysis study show thatiron(Ⅱ) complex containing ED-TA and 2 ,2'-bipyridine on its thermalde composition form the corresponding Fe2O3 oxide in nano size at the temperature range ～475 ℃ .The iron(Ⅱ) complex was performed as a convenient low cost precursor for the preparation of Fe2O3 nanoparticles by the the thermal decomposition method .The iron(Ⅲ) oxide composition has been discussedusing FTIR ,X-ray diffraction (XRD) ,transmission electron microscopy (TEM) and ener-gy-dispersive X-ray spectroscopy (EDX) .