Patent ID: 8188278

Claim:
A photosensitizer dye, being a ruthenium-based complex represented by formula (1): wherein in formula (1), X 1 is represented by formula (2); and X 2 is hydrogen or the same as X 1 ; wherein in the formula (2), Ra and Rb are each independently hydrogen, C m H 2m+1 with m from 1 to 15 or OC p H 2p+1 with p from 1 to 15; and n is from 1 to 4; wherein in the formula (1), Y 1 is hydrogen, lithium, sodium or a tetra-alkyl ammonium group represented by formula (8); and Y 2 is hydrogen or the same as Y 1 ; and wherein in formula (8), A, B, C and D are each independently hydrogen or C m H 2m+1 with m from 1 to 15.