Part of the photophysical properties of Pyr2Bpy have been first reported by E. Orti and co-workers in the context of their study of [Ir(Ppy)2(Pyr2Bpy), with Ppy = phenylpyridine. As Pyr2Bpy is poorly soluble in most of the common solvents , we limited our investigations to THF, a solvent for which the solubility is high enough to carry out femtosecond transient absorption measurements of the ligand. The absorption spectrum of Pyr2Bpy exhibits a set of relatively narrow peak between 250 nm and 330 nm corresponding to S0 → Sn electronic transition localized on the bipyridine and pyrene moiety and a broad featureless band with a maximum at 360 nm assigned to the HOMO-LUMO transition involving an electronic density delocalized over the whole ligand (Figure ) . The photoluminescence spectrum excited at 350 nm shows a strong emission band with a maximum at 442 nm. The excitation spectrum recorded at em = 440 nm corresponds to the absorption spectrum (Figure .a).