NOVELTY - A metal-complex pigment (1) is novel.    USE - For photoelectrode used in dye-sensitized solar cell (both claimed).    ADVANTAGE - The metal-complex pigment has excellent photosensitization characteristics and/or redox characteristics. The photoelectrode and dye-sensitized solar cell containing the pigment have excellent photoelectric conversion efficiency.    DETAILED DESCRIPTION - A metal-complex pigment of formula (1) is novel.    M = atom of metal chosen from iron, ruthenium, osmium, platinum, iridium, rhenium, rhodium, lead and/or their ions;    R1, R2 = group of formula: -XOm(OH)n;    X = atom chosen from carbon, sulfur and/or phosphorus;    m, n = 1 or 2;    m+n = 2 or 3;    R3, R4 = -CF3, -N(R11)2, fluorine, chlorine, bromine, iodine, -OR11, -SR11, -C(O)R11, -CO2R11, -SO2R11, -SO3R11, - C(O)N(R21)2, -CN and -NO2;    L1, L2 = fluorine, chlorine, bromine, iodine, -OH, -SH, -SCN, -NCS or group of formula: R31-C(O)-CH-C(O)-R31;    R11 = 1-12C alkyl, 2-12C alkenyl, and 6-16C aryl;    R21 = H, 1-12C alkyl, 2-12C alkenyl and/or 6-16C aryl;    R31 = 1-12C alkyl, 6-25C aryl, and/or beta-diketone having structure of formula (4);    a-d = 1-4; and    e, f = 1-5.    At least one ligand is chosen from ligand substituted by alkoxy, cyano, or halogen atom.    X = atom chosen from carbon, nitrogen, sulfur, and oxygen;    Y = nitrogen;    Z = H, mercapto, and/or lower alkyl;    m = 2-7;    n = 2-6;    p = 0 or 1; and    r = 0-2.    INDEPENDENT CLAIMS are included for the following:    (i) photoelectrode (10) comprising a semiconductor electrode (2) having light-receiving layer (F1-F3); and    (ii) a transparent electrode (1) adjoined and arranged on the light-receiving layer.    The semiconductor electrode contains the metal-complex treatment; and dye-sensitized solar cell comprising the photoelectrode, semiconductor electrode and a counter electrode. The semiconductor electrode and counter electrode are arranged opposite through an electrolyte.    DESCRIPTION OF DRAWING(S) - The figure shows the model sectional drawing of the photoelectrode.    Transparent electrode (1)    Semiconductor electrode (2)    Transparent electrically conductive film (3)    Transparent substrate (4)    Photoelectrode (10)    Light-receiving layer (F1-F3)