Studies on Cubalt Complexes with a Sulphur-Nitrogen Donor Ligand

Abstract

Cobalt(II) complexes of 2-furFuraldehyde thiosemi-carbazone, C₆H₇O5N₃ (ligand), of the general formulae Co(ligand-H) X¹ ₂, 2H₂O and Co(ligand-H)₂ (where X = NO⁻ ₃, Cl⁻, Br⁻, l⁻ or SCN⁻ and X¹ = 1/2 50⁻ ₄ or CH₃COO⁻) have been prepared and characterised by elemental analysis, magnetic moment measurements, IR and electronic soectral studies. All of these complexes are paramagnetic. Ligand field parameters like Dq, Racah inter-electronic repulsion parameter B, nephelauxetic ratio β and ligand field stabilization energy (LFSE) have been calculated from the electronic spectra. IR spectra show that the ligand acts as a bidentate chelating utilising a sulphur atom in the thiol form and one nitrogen atom for coordination to the central metal ion. Octahedral and square planar geometry have been suggested for these complexes.