NOVELTY - A dinuclear ruthenium complex dye ((1-1), (2-1) or (3-1)), is new.    USE - Novel dinuclear ruthenium complex dye is used for manufacture of photoelectric transducer used for photogalvanic cell (all claimed).    ADVANTAGE - The photoelectric transducer comprising dinuclear ruthenium complex dye provides high photoelectric conversion efficiency in short adsorption time, and has excellent optical absorption capability over large optical wavelength region. The ruthenium-osmium complex dye has highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) matching with energy level, and improved electron transfer property.    DETAILED DESCRIPTION - A dinuclear ruthenium complex dye of formula ((1-1), (2-1) or (3-1)), is new.    R01=linear or branched 2-18C alkyl;    X=counter-ion;    n=number of counter-ions required to neutralize electric charge of complex;    R02=linear or branched 2-18C alkyl, and couples with carbon atom to form aromatic-hydrocarbyl ring or aliphatic-hydrocarbyl ring;and    R1-R8=H or hydrophobic substituent chosen from alkyl, aralkyl or aryl, where all dinuclear ruthenium complex color materials (R1-R8) are not H.    Proton (H+) of 1 or several carboxyl groups (-COOH) dissociates optionally. INDEPENDENT CLAIMS are included for the following:    (1) ruthenium-osmium complex dye of formula (4-1);    (2) photoelectric transducer, which includes dinuclear ruthenium complex dye or ruthenium-osmium complex dye, and semiconductor fine particles;    (3) photogalvanic cell, which is provided with photoelectric transducer;    (4) manufacture of photoelectric transducer, which involves immersing semiconductor fine particles into a solution containing dinuclear ruthenium complex dye or ruthenium-osmium complex dye;    (5) single nuclear ruthenium complex precursor of formula (1-2), (2-2) or (3-2);    (6) single nuclear ruthenium complex of formula (1-3), (2-3), (2-4), (3-3) or (3-4);    (7) single nuclear osmium complex precursor of formula (4-2); and    (8) single nuclear osmium complex of formula (4-3) or (4-4).    R04=linear or branched 1-18C alkyl, linear or branched 1-18C alkoxy, 6-15C aryl, 6-15C aralkyl, 6-15C aralkyl oxy or 6-15C aryloxy.    Proton (H+) of 1 or several carboxyl groups (-COOH) dissociates optionally.