TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (disclosed): A ruthenium complex compound of formula (1a) and 2,2'-bipyridine-4,4'-dicarboxylic acid are reacted with ammonium thiocyanate in presence of N,N-dimethylformamide, to obtain metal complex dye (1). Preferred Component: A photoelectric transducer has thin film of oxide particulate semiconductor provided on a substrate. The thin film of oxide particulate semiconductor is supported with metal complex dye or its salt (1) and/or organic dye having one or more types of metal complex dye or its salt (1), and structures other than formula (1) in presence of inclusion compound. The thin film of oxide particulate semiconductor is a thin film containing titanium dioxide, zinc oxide or stannic oxide. The metal complex dye or its salt (1) is of formula (5 or 6).R1=optionally substituted aliphatic-hydrocarbon residue. Preferred Definitions:    A3=optionally substituted aliphatic-hydrocarbon residue, preferably 6-8C linear alkyl;    A1,A2=substituent, and A1 and A-2 may couple to form dioxan ring;    n2=2;    A4,A5=H;    A6=n-hexyl;and    R1=methyl.    The group of formula (3) is group of formula (4).    SPECIFIC COMPOUNDS - 26 metal complex dyes such as compound of formula (I-V) are disclosed.    EXAMPLE - Dichloro(p-cymene)-ruthenium (II) dimer (in mg) (114), and 4,4'-bis(2-(2,2'-bithiophene-5-yl)ethynyl)-2,2'-bipyridine (200) were added to dry dimethylformamide solution (80 ml), and heat-stirred at 60 degrees C for 4 hours under nitrogen atmosphere. Then, 4,4'-dicarboxyl-2,2'-bipyridine (91) was added, stirred and heat-refluxed at 160 degrees C for 4 hours. Further, ammonium-thiocyanate (1.42) was added to the resulting mixture, heat-stirred at 150 degrees C for 5 hours, cooled, evaporated and concentrated. Water was poured to the resulting mixture and heated at 5 degrees C for overnight. The resulting black precipitate was suction-filtered, dispersed to chloroform (30 ml), dried, stir-washed and suction- filtered, to obtain a crude product of cis-4,4'-bis(2-(2,2'-bithiophene-5-yl)ethynyl)-2,2'-bipyridine-4,4'-dicarboxy-2,2'-bipyridine-bithiocyanate ruthenium (II) (0.0373 g). The obtained cured product was purified, and methanol (30 ml) and methanol solution (0.50 ml) of tetrabutyl ammonium hydroxide were added, and concentrated at 5 degrees C for overnight. The resulting mixture was filtered and vacuum-dried, to obtain black powder of cis-4,4'-bis(2-(2,2'-bithiophene-5-yl)ethynyl)-2,2'-bipyridine-4,4'-dicarboxy-2,2'-bipyridine-bithiocyanate ruthenium (II) (139).