Functionalized tetradentate ligands for Ru-sensitized solar cells

Syntheses of 6,6′-bis(1-H-benzimidazol-2-yl)-4,4′-bis(methoxycarbonyl)-2,2′-bipyridine and a series of new quaterpyridines as functionalized tetradentate ligands is described. A molecular engineering was developed allowing different solubilities, π-systems or grafting modes.