Investigation of Thiosemicarbazones as Chelating Agents. Synthesis and Spectroscopic Characterization of Some New Ruthenium(III) Complexes

Abstract

New octahedral complexes of Ru(III) with salicylaldehyde, 5‐chlorosalicylaldehyde, 5‐methoxysalicylaldeyhyde, 2‐hydroxynaphth‐aldehyde and dehydroacetic acid thiosemicarbazones have been synthesized and characterized by elemental analyses, IR, UV‐Vis. spectra, magnetic moments, conductivity, ESR spectra and thermal analysis. The molar conductance measurements indicate that, the complexes are non‐electrolytes except for complex (L⁵H)₂Ru]Cl·2H₂O (10). The ESR spectra of the complexes (L⁵H)Ru(Cl)₂(H₂O)·2H₂O (9) and (L⁵H)₂Ru]Cl·2H₂O (10), (L⁵H₂ = dehydroacetic acid thiosemicabazone) show axial type symmetry (d_xz), with mixed ionic‐covalent bond character. The electrochemical data for the complexes (1), (2) and (5) are discussed.