TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The dichloromethane solution of 4,4,4-trimethoxy carbonyl-2,2:6,2-terpyridine and ethanol solution of ruthenium trichloride are reacted at 70-90degreesC for 2-4 hours. The obtained terpyridine derivative was reacted with naphthalene derivative of formula (a), to obtain the ruthenium complex. Preferred Definition:    R3 and R4=H, halogen atom, 1-20C alkyl, aryl, aminoalkyl or alkoxy group;    L'=1,8-diamino naphthalene derivative of formula (b-e);    R1 and R2=H or (un)substituted lower alkyl group;    R5=H, 1-20C alkyl, (un)substituted phenyl or (un)substituted benzyl group;    R6, R7=H, alkyl or (un)substituted phenyl group, and optionally bond to form 5 or 6-membered ring;and    R8=H, 1-20C alkyl, (un)substituted phenyl or (un)substituted benzyl group.    EXAMPLE - Dichloromethane solution (120 ml) of 4,4,4-trimethoxy carbonyl-2,2:6,2-terpyridine (in g) (0.4) and ethanol solution (100 ml) of ruthenium trichloride (0.26) were refluxed for 2 hours and concentrated. The product was washed to obtain trichloro (4,4,4-trimethoxy carbonyl-2,2:6,2-terpyridine) ruthenium. The obtained trichloro (4,4,4-trimethoxy carbonyl-2,2:6,2-terpyridine) ruthenium (3), methanol solution (100 ml) of 1,8-diamino naphthalene and triethyl amine (0.5 ml) were refluxed for 8 hours. The solvent was removed. The obtained solid product was dissolved in dimethyl formamide (30 ml), refluxed with sodium thiocyanate aqueous solution (5 ml) for 8 hours and further with triethyl amine (10 ml) for 24 hours or more. The reaction mixture was cooled and evaporated. The obtained solid substance was dissolved in sodium hydroxide solution, filtered and dried to obtain 1,8-diamino naphthalene thiocyanate (4,4',4"-tricarboxy-2,2',2",6-terpyridine) ruthenium. The obtained 1,8-diamino naphthalene thiocyanate (4,4',4"-tricarboxy-2,2',2",6-terpyridine) ruthenium, tetra butyl ammonium thiocyanate aqueous solution and tetrabutyl ammonium hydroxide solution were mixed. The solution was filtered, mixed with 0.1 M nitric acid, cooled, heated, filtered and dried to obtain ruthenium complex. A glass plate having titanium oxide film was immersed in a solution containing the obtained ruthenium complex for 5 hours, to form dye sensitizing oxide semiconductor electrode. A solar cell equipped with the obtained electrode had favorable quantum efficiency.