Structural Prediction of Bis { (di- p -anisole)-1,4-azabutadiene } -bis[triphenylphosphine]ruthenium(II) Using 31 P NMR Spectroscopy

The present paper reports the use of 31 P NMR spectroscopy to predict the isomer structures of [bis { 4-methoxy-phenyl-[3-(4-methoxy-phenyl)-allylidene]-amino } ]-bis[triphenylphosphine]ruthenium(II), also known as bis { (di- p -anisole)-1,4-azabutadiene } -bis[triphenylphosphine]ruthenium(II), complexes. The complexation reaction was carried out under refluxing condition of (di- p -anisole)-1,4-azabutadiene (compound 1 ), triphenylphosphine (PPh 3 ), and ruthenium chloride in the ratio of 2 : 2 : 1 for five hours. In addition, ruthenium(II) complexes were also characterized using FTIR and UV-Vis spectroscopy to support the formation of ruthenium(II) complexes. 31 P NMR spectroscopic study on ruthenium(II) complexes suggested that there are three isomers present after the complexation reaction and all the ruthenium complexes demonstrate octahedral geometry.