TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation is given. Preferred Group: The heterocyclic group (I) is fluorine-containing group of formula: X1-(Ar1)m-(Ar2)n-(Ar3)p-X2 (III) or of formula (IV). The heterocyclic group (II) is fluorine-containing group of formula: X3-(Ar4)q-(Ar5)r-(Ar6)s-X4 (V) or of formula (VI).R,R10=H, 1-20C alkyl, 1-20C fluoroalkyl, 1-20C alkoxy or 1-20C fluoroalkoxy;Z1=-C(-R3)=C(-R4)-, -S-, -O-, -C(-R5)=N-, -N(-R6)-, -S(=O)-, -S(=O)2-, -Se- or -Te-, preferably -S-;R3-R6,R13-R16=H or monovalent group;or R3+R4,R13+R14=ring;X1,X2=fluorine-containing group (IV);Ar1-Ar5=bivalent 6C or more aromatic hydrocarbyl or bivalent 4C or more heterocyclic group (both optionally substituted), preferably optionally substituted thienylene;m,n,p-s=0-6;n+m+p,q+r+s=1 or more;Z2=-C(-R13)=C(-R14)-, -S-, -O-, -C(-R15)=N-, -N(-R16)-, -S(=O)-, -S(=O)2-, -Se- or -Te-, preferably -C(-R13)=C(-R14)- or -S-;andX3,X4=fluorine-containing group (VI).Preferred Compound: The conjugated compound has two or more fluorine-containing group (IV) or fluorine-containing group (VI). Preferred Definitions:    A=cyano.    SPECIFIC COMPOUNDS - 6 Conjugated compounds are disclosed e.g. 2-(2-(5-(5-(5-(4,6-bis(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4-hexylthiophen-2-yl)thiophen-2-yl)-3-hexylthiophen-2-yl)-6-(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-4-ylidene)propanedinitrile of formula (Ia), 2-(2-(5-(5-(5-(4,6-bis(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4-hexylthiophen-2-yl)-3-hexylthiophen-2-yl)thiophen-2-yl)-4-(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-6-ylidene)propanedinitrile, 2-(2-(10-(4,6-bis(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-7,7-dihexyl-3,11-dithiatricyclo(6.3.0.02,6)undeca-1(8),4,9-trien-4-yl)-6-(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-4-ylidene)propanedinitrile, 2-(2-(7-(4,6-bis(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-9,9-dioctyl-9H-fluoren-2-yl)-6-(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-4-ylidene)propanedinitrile and 2-(2-(5-(7-(5-(4,6-bis(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-2-yl)thiophen-2-yl)-9,9-dioctyl-9H-fluoren-2-yl)thiophen-2-yl)-4-(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-6-ylidene)propanedinitrile.    EXAMPLE - 2,5-Bis(4-hexylthiophen-2-yl)thiophene (in mg) (50), 2-bromo-5,5-difluoro-4H-cyclopenta(b)thiophene-4,6(5H)-dione (29), tetrakis(triphenylphosphine)palladium (6) and toluene (1 mL) were mixed at 120 degrees C for 12 hours, distilled and purified to obtain 2-(5-(5-(5-(5,5-difluoro-4,6-dioxo-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4-hexylthiophen-2-yl)thiophen-2-yl)-3-hexylthiophen-2-yl)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophene-4,6-dione (16). 2-(5-(5-(5-(5,5-Difluoro-4,6-dioxo-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4-hexylthiophen-2-yl)thiophen-2-yl)-3-hexylthiophen-2-yl)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophene-4,6-dione (6), malononitrile (15) and absolute ethanol solution (1 mL) of ammonium acetate (2) were mixed at 80 degrees C, cooled, concentrated and purified, to obtain 2-(2-(5-(5-(5-(4,6-bis(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4-hexylthiophen-2-yl)thiophen-2-yl)-3-hexylthiophen-2-yl)-6-(dicyanomethylidene)-5,5-difluoro-4H,5H,6H-cyclopenta(b)thiophen-4-ylidene)propanedinitrile (3), with yield of 25%.