Synthesis, characterization, spectroscopic and electrochemical properties of trans,trans,trans-bis(triphenyl phosphine) bis(aroyl hydrazonato)ruthenium(II) complexes

Four ruthenium (II) complexes of general formula Ru(PPh3)2(L)2 have been synthesized and characterized. The spectroscopic and cyclic voltammetric studies of these complexes are also reported. X-ray crystal structure determination of two of the complexes reveal that Ru(II) occupies trans,trans,trans-(t,t,t) N2O2P2 centrosymmetric octahedral environments, with the ligand pair occupying the equatorial plane. 31P NMR confirms the presence of two trans-PPh3 groups in all the complexes. The transformation of the complexes in dichloromethane solution is studied by spectrophotometry and 31P NMR spectroscopy.