abstract |
This application presents invention relevant to a tridentate ligand deriving from 4, 4'-dicarboxy-2, 2'-bipyridine basic unit and said tridentate ligand of formula (I): R is wherein Y, R1, R2, R3 and R4 are defined according to the specification mentioned in the claims. The present invention also provides a metal complex containing said tridentate ligand and a dye-sensitized solar cell containing said metal complex. |