Abstract

Mixed ligand complexes of iron(II) with polypyridine ligands like 1, 10-phenanthroline (phen), 2,2′-bipyridine (bpy) and oxalic acid (ox) have been synthesized, viz. [Fe (phen)2ox]. 5. 2H2O and [Fe(bpy)l. 04(ox)1. 1]. 0. 3H2O and were characterized by analytical, spectral, magnetic and thermal studies. Variable temperature magcetic measurements indicate spin cross-over changes of the Fe(II) complexes with temperature. Mossbauer studies confirm the predominantly low-spin nature of the complexes at low temperature while the X-ray photoelectron spectrum (XPS) of the bpy complex shows divalency of the metal center. The minor variations in the crystal packing due to the change in the method of preparation and the number of water molecules present in the crystal lattice drastically change the magnetic behaviour of these systems when compared with those of analogous complexes reported earlier.

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