SYNTHESIS, MAGNETIC AND SPECTRAL STUDIES OF IRON(III) AND COBALT(II,III) COMPLEXES OF 4-FORMYLANTIPYRINE N(4)-SUBSTITUTED THIOSEMICARBAZONES

The synthesis and characterization of complexes of iron(III), cobalt(I I) and cobalt(III) with 4-formylantipyrine N(4)-methyl-, N(4)-dimethyl -, and 3-piperidylthiosemicarbazones are reported. Elemental analyses, molar conductivities, magnetic measurements and spectral (i.r., elect ronic and e.s.r.) studies have been used to elucidate the nature of th e metal complexes. The i.r. spectra show that the thiosemicarbazones b ehave as bidentate or tridentate ligands, either in the thione or thio lato form. Different stereochemistries are proposed for the various co balt(II) complexes on the basis of spectral and magnetic studies.