Syntheses, characterization and luminescence of Pt–M (M = Re, Ru, Gd) heteronuclear complexes with 5-ethynyl-2,2′-bipyridine

Incorporation of diplatinum component [Pt2(μ -dppm)2(Ctriple bond; length of mdashCbpy)4] (1, dppm = Ph2PCH2PPh2, Ctriple bond; length of mdashCbpy = 2,2′-dipyridyl-5-acetylide) with Re(CO)5Cl, Ru(bpy)2Cl2 (bpy = 2,2′-bipyridine) and Gd(hfac)3(H2O)2 (Hhfac = hexafluoroacetylacetone) via 2,2′-dipyridyl chelating induced isolation of View the MathML sourcePt2IIRe4I (2), View the MathML sourcePt2IIRu4II (3), and View the MathML sourcePt2IIGd2III (4) complexes, respectively. The structures of 2 and 4 were determined by X-ray single crystal diffraction. Intense low-energy absorptions occur in the range 360–510 nm originating from metal-to-ligand charge transfer (MLCT) transitions. These compounds display photoluminescence in both solid states and dichloromethane at room temperature with emissive lifetimes in the range of microseconds.