Abstract
The syntheses of cationic ruthenium(II) complexes [Ru(Me-2-bpy)(PPh3)(2)RR'][PF6](x) {Me-2-bpy = 4,4'-dimethyl-2,2'-bipyridine, (3) R = Cl, R' = N CMe, x = 1, (4) R = Cl, R' = N CPh, x = 1, (5) R = R' = N CMe, x = 2} and [Ru(Me-2-bpy)(kappa(2)-dppf)RR'][PF6](x) {dppf = 1,1'-bis(diphenylphosphino) ferrocene, (6) R = Cl, R' = N CMe, x = 1, (7) R = Cl, R' = N CPh, x = 1, (8) R = R' = N CMe, x = 2} are reported, together with their structural confirmation by NMR (P-31, H-1) and IR spectroscopy and elemental analysis, and, in the case of trans-[Ru(Me-2-bpy)(PPh3)(2)(N CCH3)Cl][PF6] (3), by X-ray crystallography. Electronic absorption and emission spectra of the complexes reveal that all complexes except 4 and 6 are emissive in the range 370-400 nm with 8 exhibiting an emission in the blue. Cyclic voltammetry studies of 3-8 show reversible or quasi-reversible redox processes at ca. 1 V, assigned to the Ru(II/III) couple.