Synthesis and characterization of iron (II, III) complexes of 3-hydroxy-benzaldehyde isonicotinic acid hydrazone

Fe(II) and Fe(III) complexes of 3-hydroxybenzaldehyde isonicotinic acid hyd razone (3-HBINAH) have been synthesized and characterized by elemental anal yses, magnetic susceptibility, electronic, TR, ESR, Mossbauer and XRD studi es. The IR spectral studies indicate that nitrogen of azomethine and the ox ygen of carbonyl group of the ligand participate in coordination in both th e complexes while giving no evidence for the presence of lattice, or coordi nated water. The presence of unidentate sulphate, (NH4)(+) ion in iron(II) complex and Fe-CI bonds in iron(III) complex are also indicated. The Mossba uer, electronic and electron spin resonance spectral studies and magnetic s usceptibility measurements suggest octahedral geometry probably with a slig ht distortion to both the complexes. The X-ray powder diffraction data indi cate that both the Fe(II) and Fe(III) complexes belong to the tetragonal cr ystal systems.