Synthesis and characterization of Ru(III) complexes with thiosemicarbazide-based ligands

Abstract

Three Ru(III) complexes general formula Na[RuL₂] (where L = dibasic tridentate thiosemicarbazone ligands) have been synthesized by reacting RuCl₃ with thiosemicarbazide-based ligands with ONS donors. Ligands of general formula (X)N-NH-C(S)-NH₂ were prepared through the condensation reaction of salycilaldehide or its derivatives (X = salicylaldehyde, 5-Cl-salicylaldehyde, 5-Br-salicylaldehyde) with thiosemicarbazide. Complexes have been formulated and characterized by mass spectrometry and infrared spectroscopy. The data showed the formation of a complex with a 1:2 metal:ligand stoichiometries.The ligands coordinated as an ONS tridentate dianion through the oxygen atom of the deprotonated phenolic OH-group, the azomethine nitrogen atom and the sulfur atom after deprotonation of the thiosemicarbazide residue in its thiol form.