TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): A benzene ring-containing compound of formula (1a) is reacted with ruthenium complex of formula: (RuCl2(p-cymene))2 (1b), isonicotinic acid-containing compound of formula (1c), and ammonium thiocyanate, to obtain a ruthenium-type sensitizer (1). Preferred Compound: The ruthenium-type sensitizer (1) is formula (2): Preferred Process: The ruthenium-type sensitizer (2) is obtained by reacting the benzene ring-containing compound (1a) with ruthenium complex (1b), pyridine-containing compound of formula (2a) and ammonium thiocyanate. Preferred Component: A dye-sensitized photoelectric conversion element comprises oxide semiconductor particles containing the ruthenium-type sensitizer (1). The oxide semiconductor particles comprise titanium dioxide as an essential component. Preferred Definitions:    R=1-5C saturated alkyl.    SPECIFIC COMPOUNDS - 4 Ruthenium-type sensitizer compounds such as compound of formulae (I-IV), are claimed.    EXAMPLE - A bipyridine-containing compound of formula (a) (in g) (0.24) was melted using tetrahydrofuran (20 mL) under argon condition. Then, 4-(4-methyl-2,5-bis(3-methylbutoxy)styryl)-2,5-bis(3-methylbutoxy)benzaldehyde (0.66) melted using tetrahydrofuran (20 mL) was added to the resulting solution, and agitated at normal temperature for 8 hours. The resulting mixture was reacted in vacuum, and the solvent was removed from the mixture. 5 M hydrochloric acid solution (20 mL) was added to the resulting mixture, extracted using dichloromethane (20 mL), dried, and purified using ethylacetate/hexane in ratio of 1:3 with column chromatography, to obtain 2-(2,5-Bis-(3-methyl-butoxy)-phenyl)-vinyl-2,5-bis-(3-methyl-butoxy)-4-vinyl-benzene-bipyridine-containing compound of formula (b). The obtained compound (b) (0.22), and dichloro(p-cymene)ruthenium(II) dimmer (0.051) were added to dimethylformamide solvent, and agitated at 80 degrees C for 4 hours. 4,4'-dicarboxylic acid-2,2'-bipyridine (41 mg) was added to the resulting mixture and agitated at 160 degrees C for 4 hours. Then, ammonium thiocyanate (0.19) was added to the resulting mixture and agitated at 130 degrees C for 4 hours, and the solvent was removed in vacuum. Water (200 mL) was added and the mixture was filtered. The filtered solid was dried and melted using tetrabutylammoniumhydroxide and separated using methanol as diluent. The separated solution was added to 0.1 M nitric acid, to separate the sediment, and the sediment was filtered and dried, to obtain ruthenium-type sensitizer compound (I).