Synthesis, spectroscopy and electrochemistry of mixed-ligand complexes of platinum(II) and palladium(II)

Mixed-ligand complexes [MX2(MBPY)] (M = PdIIor PtII; X = Cl−, I−, N−3or NO2−; MBPY = 4,4′-dimethyl-2,2′-bipyridine) have been prepared and characterised by elemental analyses, conductivity measurements, i.r., electronic absorption and 1H-n.m.r. spectroscopic techniques. The cyclic voltammograms of these complexes suggest the involvement of the metal dπ orbital in the one-electron oxidation process and the π* orbital of the MBPY in the one-electron reduction process. [Pt(MBPY)(N3)2] shows solution-state luminescence at room temperature.