TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (disclosed): The single nuclear ruthenium complex precursor of formula (a) is reacted with of 8,8-dichloro-7,7',9,9'-tetraaza-8-ruthena-8,8'-spirobi(tricyclo-tridecan)-2,3',4,5',10,10',12,12'-octaene-4,4',12,12'-tetracarboxylic acid, to obtain dinuclear ruthenium complex dye of formula (b). Preferred Components: The semiconductor fine particles are chosen from titanium oxide, zinc oxide and tin oxide. The photogalvanic cell has photoelectric transducer, counter electrode as an electrode, and electrolyte layer provided between photoelectric transducer and counter electrode. Preferred Process: A semiconductor layer containing semiconductor fine particles is formed on an electroconductive support component, and the semiconductor layer is immersed into solution containing dinuclear ruthenium complex dye or ruthenium-osmium complex dye, to manufacture photoelectric transducer. EXAMPLE - Single nuclear ruthenium complex of 2,2'-bipyridine-4,4'-dicarboxylic acid with fluorophosphates ion (in g) (1.01) and water (20 ml) were added, tetrabutyl ammonium hydroxide aqueous solution (5.8 ml) was dripped, dissolved in argon gas atmosphere, and concentrated. The obtained concentrate was dissolved in 2-methoxy ethanol (100 ml) under reduced pressure, single nuclear ruthenium complex (1.26) was added into solution, and refluxed for 20 minutes, stirred, filtered, the filtrate was concentrated under reduced pressure, water (150 ml) and methanol (250 ml) were added to obtained concentrate, hexafluoro-phosphate aqueous solution (0.5 mol/l) was dripped into filtrate, cooled at 4 degrees C, precipitated, filtered, washed using hexafluoro-phosphate aqueous solution, acetone/diethyl ether (4:1) and diethyl ether, and dried, to obtain crude dinuclear ruthenium complex dye (2.15). The crude dinuclear ruthenium complex dye and water (150 ml) were added, lithium hydroxide aqueous solution (3.2 ml) was dripped, dissolved, hexafluoro-phosphate aqueous solution (0.5 mol/l) was dripped, filtered, cooled, precipitated, filtered, washed using hexafluoro-phosphate aqueous solution, acetone/diethyl ether and diethyl ether, and dried, to obtain dinuclear ruthenium complex dye (1.68).