Synthesis and characterization of mono and dinuclear Ru(II) complexes with hexadentate ligands having N 2P 4 and N 2As 4 donor atoms

Abstract

The reactions of RuCl 2(DMSO) 4 (1) and RuCl 2(PPh 3) 3 (2) with the ligands α, α'-bis(bis(2-(diphenylphosphino)ethyl)amino)ethane (BDPE), α, α'-bis(bis(2-(diphenylarsino)ethyl)amino)ethane (BDAE) and α, α'-bis(bis(2-(diphenylphosphino)- m-xylene (BDPX) were carried out with 2:1 or 1:1 metal ligand molar ratios in different conditions. In the reaction of 1 with L (LBDPE, BDPX) with a 2:1 molar ratio a mixture of two dinuclear octahedral complexes of the compositions [Ru 2L(DMSO) 4Cl 2]Cl 2 and [Ru 2L(DMSO) 2Cl 4] were obtained. These complexes were separated by column chromatography and characterized. With a 1:1 molar ratio of 1 and L, mononuclear complexes as the major product along with some quantities of dinuclear complexes were formed. These complexes were separated and characterized. The reaction of 2 with the ligands L (LBDPE, BDAE, BDPX) with a 2:1 molar ratio in dichloromethane resulted in the formation of dinuclear complexes of composition [Ru 2L(PPh 3) 2Cl 4]. The reaction of 2 with BDPE and BDPX in ethanol with longer refluxing time resulted in the displacement of all the three PPh 3 groups of 2 with the formation of complexes of the composition [Ru 2LCl 4]. Electrochemical studies of these complexes were also carried out.