NOVELTY - A bipyridine ligand (I) and/or (II) is new.    USE - Compound (I) and/or (II) is used as anchoring ligand in organometallic sensitizer of dye sensitized solar cell or photoelectric conversion device (claimed).    ADVANTAGE - The compound (I) and/or (II) enhances power conversion efficiencies; exhibit improved light-harvesting ability; enhances molar absorptivity; and is prepared with fewer raw materials. The dye exhibits redshifted absorption band as compared to conventional dyes including N719 and Z907.    DETAILED DESCRIPTION - The bipyridine ligand of formula (I) and/or (II) is new.    R1-R19=-(Az)-Anc (a);    n=1-5;    z=1-n; and    Az=4-20C aryl, where aryl comprises 1-10 heteroatoms.    Provided that:    (1) Az represents Zth moiety of n successive moieties A, and any Az may be different from any other Az;    (2) if more than one of R1-R8 of compound (I) or more than one of substituents R9-R19 of compound (II), respectively, are substituent of compound (a) , any n of such substituent may be same or different from n of another substituent of compound (a);    (3) any Az may be different from respective Az of another substituent of compound (a);    (4) the aryl is other than substituent Anc, and is optionally substituted;    (5) if n is greater than or equal to 2, Az is optionally substituted vinylene and ethynylene;    (6) at least one Az is aryl as defined above;    (7) Anc is independently selected anchoring group; and    (8) any one of R1-R19, which is not substituent of compound (a), is H, halo or 1-20C hydrocarbon comprising 0-20 heteroatoms.    INDEPENDENT CLAIMS are included for:    (1) a dye of formula ML1L2L3L4, ML5L3L4L6, or ML5L2L4; and    (2) photoelectric conversion device which comprises light absorption layer (3), semiconductor material , and dye layer (5) comprising the dye and/or compound (I) and/or (II).    M=metal atom consisting of Ru, Os, Ir, Re, Rh, or Fe;    L1=compound (I);    L2=compound (I) or bidentate ligand comprising 3-30C hydrocarbon comprising 2-20 heteroatoms;    L3, L4, L6=monovalent ligands consisting of H2O, -Cl, -Br, -I, - CN, -NCO, -NCS and -NCSe; and    L5=compound (II).    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating a dye-sensitized solar cell.    Light absorption layer (3)