Structural and spectroscopic properties of Ru(II) complexes of 4-(aryl)thiosemicarbazones of thiophen-2-carbaldehyde

In Ru(II) complexes of formula [Ru(L)2(PPh3)2] (LH = 4-(aryl)thiosemicarbazones of thiophen-2-carbaldehyde) ruthenium is six coordinate with a distorted octahedral cis-P2, cis-N2, trans-S2 donor environment, and each of the two thiosemicarbazones are coordinated forming a four membered chelate ring. EPR and DFT calculations suggest that the assignment of metal atom oxidation states in these compounds is not unambiguous.