TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The photoelectric transducer has an insulating porous material provided between the light reception electrode (5) and counter electrode (4).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): A nitrogen-containing compound of formula (8a) is deprotected in the presence of transition metal catalyst to obtain the dye.Z1-Z3=at least one being group of formula: -C(=O)-O-CH2-CH=CH2 and other being acidic group;andor at least one of Z1, Z2=electron withdrawing group.Preferred Compound: The compounds (Ia-Ic) are chosen from 10 compounds, e.g. of formulae (VIIa,VIb,IIc).L'=bivalent coupling group chosen from alkenylene, alkynylene and arylene;Ra,R3a,R4a,R1b=R1;or R1a+R2a+L'=ring;B'=atomic group required to form ring with two carbon atoms and nitrogen atoms;R2b-R9b=H or substituent of formula: -(C(-R10b)=C(-R11b))r-C(-R13b)=R12b;R10b,R11b,R13b=H, aliphatic group, aromatic group or heterocyclic group;r=0 or more;R12b=group of formula (VIIb or VIIIb) group;R15b,R16b=aliphatic group, aromatic group or heterocyclic group having acidic group;l=0 or 1;R17b=S or group of formula (IXb);R18b-R21b=cyano group or acidic group;andR4c-R7c=H or substituent.The photoelectric transducer contains gamma -butyrolactone in the electrolyte solution. Preferred Definitions:    Y1,Y2=carboxylic acid group;    B1c=group of formula (IIIc or IVc), preferably group of formula (VIIIc);    R7c,R9c=aliphatic group, aromatic group or heterocyclic group having acidic group;    m=0 or 1;    R8c=S or group of formula (Vc);and    R10c-R13c=cyano or acidic group.    SPECIFIC COMPOUNDS - 150 dyes (Ia-Ic) are disclosed, e.g. (2E,4E)-2-cyano-5-(2-hexyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)penta-2,4-dienoic acid of formula (I-a), (2E,4E)-5-(13-((1E,3E)-4-carboxy-4-cyanobuta-1,3-dien-1-yl)-2-hexyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)-2-cyanopenta-2,4-dienoic acid, 2-cyano-2-((2Z,5E)-5-((2E)-3-(2-hexyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)prop-2-en-1-ylidene)-3-(4-methoxyphenyl)-4-oxo-1,3-thiazolidin-2-ylidene)acetic acid, (5E)-5-((2E)-3-(2-hexyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)prop-2-en-1-ylidene)-4-oxo-2-sulfanylidene-1,3-thiazolidine-3-carboxylic acid, (2E,4E)-2-cyano-5-(2-decyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)penta-2,4-dienoic acid and (2E,4E)-2-cyano-5-(2-octadecyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)penta-2,4-dienoic acid.    EXAMPLE - (In g) 15.0 g of 10,11-dihydro-5H-dibenzo(b,f)azepine (15.0) and 1-iodohexane (21) were added to dimethylformamide (DMF) (60 ml). Sodium hydride (7.5) was added to obtain 5-hexyl-10,11-dihydro-5H-dibenzo(b,f)azepine-2-carbaldehyde (18.3). The obtained compound (9.5), phosphorus oxychloride (20 ml) in were added to DMF (60 ml) were reacted to obtain 2-((E)-buta-1,3-dienyl)-5-hexyl-10, 11-dihydro-5H-dibenzo(b,f)azepine (9.4). The obtained compound (2.0) and methyltriphenyl phosphonium iodide (3.2) and phosphorus oxychloride were reacted to obtain (E)-3-(5-Hexyl-10,11-dihydro-5H-dibenzo(b,f)azepin-2-yl)-propenal (1.9). The obtained compound (1.0) and cyanoacetic acid (0.25) were reacted to obtain (2E,4E)-2-cyano-5-(2-hexyl-2-azatricyclo(9.4.0.03,8)pentadeca-1(11),3(8),4,6,12,14-hexaen-6-yl)penta-2,4-dienoic acid (0.6). The electrochemical cell produced using the obtained compound had high conversion efficiency.