TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: A photosensitizing dye containing the complex compound is adsorbed to semiconductor fine particles layer (3) provided on an electroconductive substrate (1), to obtain photoelectric transducer. The photoelectric transducer, a charge transferring layer and a counter electrode (9) are combined to obtain photoelectrochemical cell.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The ligand (II) is preferably of formula (II-a)-(II-c), and the ligand (III) is preferably of formula (III'). The metal atom is a neutral compound chosen from iron, ruthenium and osmium.R1,R2,R5,R6,Q1,Q2,m,e,f=same as defined above;R' and R"=R1;r,s=0 or 1;andr+s=greater than or equal to1. Preferred Definitions:    R3,R4=proton donating group chosen from phenolic hydroxyl group, carboxyl group, sulfonic acid group, suquaric acid group, phosphoric acid group and boric acid group, preferably salt with organic base of carboxyl group, or carboxyl group;    R1,R2=H, halogen atom, 1-20C alkyl optionally substituted by halogen atom, 1-20C alkoxy, 2-20C alkoxy alkyl, 6-20C aryloxy, 7-20C arylalkyloxy, 7-20C aryloxy alkyl, vinyl optionally substituted by 1-20C alkyl, vinyl optionally substituted by 6-20C aryl, vinyl optionally substituted by 1-20C alkyl and 6-20C aryl, 1-20C alkylthio, 2-20C alkylthio alkyl, 6-20C arylthio, 7-20C arylalkyl thio, 7-20C arylthio alkyl, 1-20C alkyl sulfonyl, 6-20C arylsulfonyl, nitrile, amino disubstituted by 1-20C alkyl, amino disubstituted by 6-20C aryl, amino disubstituted by 1-20C alkyl and 6-20C aryl;    Y1,Y2=group of formula (IV-a or IV-b);    Ar=aromatic group optionally having substituent;    p,q=1-3;    Q1,Q2=H, 1-20C alkyl, 1-20C alkoxy, 2-20C alkoxy alkyl, 6-20C aryloxy, 7-20C arylalkyloxy, 7-20C aryloxy alkyl, 1-20C alkylthio, 7-20C arylalkyl thio, 6-20C arylthio, 7-20C arylthio alkyl, 6-20C arylsulfonyl, nitrile, or amino disubstituted by 1-20C alkyl and/or 6-20C aryl;    -(A1)m- and -(A2)n-=single bond, -S-, -SO-, -SO2- or -Se-;    a+b,c+d=2;and    m+n=1.    SPECIFIC COMPOUNDS - 70 examples for novel complex compound such as complex compounds of formulae (1-14), (1-16), (1-19), (1-25) and (1-26), are disclosed.    EXAMPLE - Ruthenium chloride-p-cymene complex alloy (RuCl2(p-cymene)) (in mg) (268) and N,N-dimethyl formamide (20) were stirred at room temperature. Then, ligand of formula (II-9) (100) was added. Further, ligand (formula (III')) (54) was added at 150degreesC and stirred for 5 hours. Then, a solution obtained by dissolving potassium thiocyanate (322) in water (2 ml) was added at 120degreesC for 5 hours. The obtained reaction solution was concentrated, fractionated and purified to obtain novel complex compound (formula (1-14)) having molecular weight of 914. The obtained novel complex compound was adsorbed to semiconductor fine particles layer provided on electroconductive substrate, to obtain photoelectric transducer. The complex compound had high solubility with respect to organic solvent, and favorable adsorption amount to semiconductor fine particles. The novel complex compound had excellent photoelectric transfer characteristics in large region of near infrared region from visible region. The photoelectric transducer containing the complex compound had excellent photoelectric conversion efficiency.