Cyanide-bridged Ru(bpy) antenna compounds: from ultrafast dynamics to solar cells

CADRANEL, ALEJANDRO; ARAMBURU TROSELJ, BRUNO M.; BARALDO, LUIS

Mendoza

Conferencia; 21st IAPS Conference; 2011

Inter-American Photochemical Society

Since pioneering work by Bignozzi and Grätzel in the late 80’s, sensitization of TiO2 with ruthenium polypiridines has been largely studied. However, although light‐to‐energy conversion has reached a maximum efficiency of only 11,6%, cyanide‐bridged polymers have not been exhaustively explored. Synthetic difficulties and potential creation of new vibrational deactivation pathways may have decreased the interest in developing polynuclear systems. We present two series of cyanide‐bridged antenna compounds, based on [Ru(tpy)(bpy)] and [Ru(tpm)(bpy)] moieties (tpy=2,2';6',2"‐terpyridine, bpy=2,2’‐bipyridine, tpm=tris(1‐pirazolyl)methane). Understanding their ultrafast excited state dynamics is of crucial importance to rationally design complexes of higher nuclearity that bear more than one Ru(bpy) chromophoric unit. Moreover, a new anchoring ligand is tested in dye‐sensitized solar cells to evaluate its incorporation into the polynuclear compounds.