Synthesis, electronic, infrared and Mossbauer spectroscopic studies of mixed ligand complexes of mono- and bis(N, N' –diethyldithio-carbamato) iron(III) with O, N and S containing chelating ligands and their thermal decomposition

Abstract

Two series of mixed ligand complexes of the general formulae Fe(dtc)₂L and Fe(dtc) L₂ where L = acetylacetone, 8-hydroxyquinoline, glycine, 1,10-phenanthroline, phenylalanine and thiomalic acid and dtc = N, N' -diethyldithiocarbamate have been synthesized and characterized by elemental analysis, electronic and infrared spectra. Room temperature Mossbauer spectra of the complexes exhibit</p> doublet with <em>δ </em>= 0.40-0.85 mms^-1 and <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0><em>E</em>_Q = 0.21-1.64 mms^-1. Magnetic moments of the complexes are in the range 3.74-5.78 B.M. suggesting equilibrium between high spin <img src='http://www.niscair.res.in/jinfo/harpoon.gif' border=0> low spin crossover. Thermogravimetric studies suggest stability of the complexes upto 200°C after which they decompose in a single or two steps with 16.8-55.0% residue at 800°C. None of the complexes is volatile.