Patent ID: 7790980

Claim:
A dye for a dye sensitized photovoltaic cell, the dye comprising: a metal composite represented by Formula 1 M(L 1 ) m1 (L 2 ) m2 X m3 Y m4 (1) wherein: M is a transition element; each of L 1 and L 2 is independently selected from the group consisting of ligands represented by Formula 1a wherein n is an integer ranging from 0 to 1, and each of R 1 , R 2 , and R 3 is independently selected from the group consisting of —CO 2 H, —PO 3 H, —SO 3 H, —CO 2 − , —PO 3 − , —SO 3 − , C1 to C20 substituted alkyl groups, C1 to C20 unsubstituted alkyl groups, C6 to C30 substituted aryl groups, C6 to C30 unsubstituted aryl groups, C6 to C30 substituted aryloxy groups, C6 to C30 unsubstituted aryloxy groups, C6 to C30 substituted arylene groups, C6 to C30 unsubstituted arylene groups, C1 to C20 substituted alkylene groups, C1 to C20 unsubstituted alkylene groups, C1 to C20 substituted alkyleneoxy groups, and C1 to C20 unsubstituted alkyleneoxy groups; X is selected from the group consisting of hydrogen, NO 2 , Cl, Br, I, CN, NCS, H 2 O, NH 3 , Cl − , Br − , I − , CN − , NCS − , and PF 6 − ; Y is selected from the group consisting of imidazolium cations; and each of m 1 and m 3 is an integer ranging from 0 to 3, m 2 is an integer ranging from 1 to 3, and m 4 is an integer ranging from 1 to 6.