Complexes of iron(III) with 1,2-dihydro- 1,5 dimethyl-2-phenyl-4-formyl (benzhydrazide)- 3H-pyrazol-3-one

Abstract

Iron(III) complexes of the schiff base, 1,2-dihydro-1,5 dimethyl -2- phenyl -4- formyl (benzhydrazide)-3H-pyrazol-3-one, [Fe(DPFBP)₂X]X₂, (where X=ClO₄, or NO₃) and

[Fe(DPFBP)₂X₂]X, &nbsp;(X=SCN, Cl or Br) have been synthesized and characterized by elemental analyses, electrical conductance in non-aqueous solvents, infrared, and electronic spectra as well as magnetic susceptibility measurements. In these complexes, DPFBP acts as a neutral bidentate ligand coordinating through the azomethine nitrogen and the carbonyl oxygen of the pyrazolone ring. The molar conductance of the complexes in DMF, methanol and nitrobenzene are in the range suggested for 1:2 electrolytes for perchlorate and nitrate complexes while the thiocyanate, chloride and bromide complexes behave as 1:1 electrolytes. The electronic spectra of the complexes exhibit a band in the region 19,230-20,080 cm^-1 due to ⁶<i>A</i>_tg →⁴<i>T</i>_tg consistent with octahedral Fe(III) complexes. The molar magnetic moment of the complexes varies in the range 5.61-6.05 B.M., indicative of octahedral geometry.