Abstract
Two series of heterochelates of ruthenium(II) containing two bipyridyl molecules and a bidentate chelating sulfurnitrogen donor ligand in the form of 4-aryl substituted thiosemicarbazides have been synthesized and characterized. The first series of complexes are dicationic in which the ring substituted 4-aryl thiosemicarbazides (NS) are chelated in the keto form through the hydrazinic nitrogen and the thione sulfur atom. They are of the [Ru(bpy) 2NS] +2 type. The second series have the general formula [Ru(bpy) 2NS] +1 in which the thiosemicarbazide moiety remains chelated to the Ru II centre through the hydrazinic nitrogen and the deprotonated thiolato S-atom. All the complexes have been characterized by elemental analysis, UV-vis, IR and EPR spectroscopy. The complexes were found to constitute a three membered redox series which were investigated by cyclic voltammetry.
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