abstract |
The present invention relates to a tridentate ligand derived from 4,4'-diacid-2,2'-bipyridine, which is represented by the following formula (I): Y, R 1 , R 2 , R 3 and R 4 are as defined in the specification and claims. The invention also provides a metal complex containing the tridentate ligand and a dye-sensitized solar cell containing the metal complex. |