Synthesis and Physico‐Chemical Studies on Iron(II,III,III) and Cobalt(II) Thiocarboxylates

TLDR: In this article, a series of iron(II,III,III) and cobalt(II) complexes of thiocarboxylic acids of the general formulas [FeIIFe2 IIIO(SOCR)6(L)3] and [Co(SocR)2(L),2] have been synthesized and characterized by elemental and thermogravimetric analyses, spectral (infrared, electronic, and Mossbauer) studies, molar conductance, magnetic susceptibility, and molecular weight determinations.

Abstract: A series of iron(II,III,III) and cobalt(II) complexes of thiocarboxylic acids of the general formulas [FeIIFe2 IIIO(SOCR)6(L)3] and [Co(SOCR)2(L)2] (R = C2H5 or C(CH3)3 and L = EtOH or py) have been synthesized and characterized by elemental and thermogravimetric analyses, spectral (infrared, electronic, and Mossbauer) studies, molar conductance, magnetic susceptibility, and molecular weight determinations. The electronic spectral data suggested an octahedral environment around the metal ion in both the iron as well as the cobalt complexes. A band around 13,800 cm−1 in the electronic spectra of the iron complexes indicated intervalence‐transfer between Fe(II) and Fe(III) moieties. A bridging mode of coordination could be assigned for the thiocarboxylate anions in the iron complexes and a chelating mode of coordination for the cobalt complexes have been suggested by infrared spectral data along with a new band at 540 cm−1, which may be ascribed owing to νasy(Fe3O) vibrations. Mossbauer studies rev...