TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): Preparation of the polymer comprises coupling monomer of formula (R1c-Ar1a-U1a-Ar1b-R1d) with monomer of formula (R1c-Ar1a-R1d) in an aryl aryl coupling reaction comprising Yamamoto coupling, Kumada coupling, Negishi coupling, Suzuki coupling, Stille coupling, Sonogashira coupling, Heck coupling, C-H activation coupling, Ulmann coupling or Buchwald coupling.Ar1a, Ar1b = 5-30C aryl or 5-30C heteroaryl (both optionally substituted with at least one L);L = 1-60C, preferably 1-20C alkyl, which is partially or completely fluorinated;U1a = fused ring moiety;R1a, R1b = H, F, 1-60C, preferably 1-20C alkyl, 1-60C, preferably 1-20C fluoroalkyl, 5-30C aromatic ring (optionally at least one H is replaced by F or 1-40C, preferably 1-10C alkyl);R1c, R1d = Cl, Br, I, O-tosylate, O-triflate, O-mesylate, O-nonaflate, -Si(CH3)2F, -SiCH3F2, -O-SO2Z1, -B(OZ2)2, -CZ3=C(Z3)2, -CCH, -CCSi(Z1)3, -ZnX0 or -Sn(Z4)3; eitherZ1-Z4 = alkyl or aryl (both optionally substituted); orZ2Z2 = cyclyl; andX0 = not defined.Preferred Components: (I) is e.g. 2,6-dioxo-3,7-dihydro-benzo(1,2-b:4,5-b')difuran-3,7-diyl, 2,6-dioxo-3,7-dihydro-1,5-dioxa-4-aza-s-indacen-3,7-diyl, 2,6-dioxo-3,7-dihydro-difuro(2,3-b:2',3'-e)pyrazin-3,7-diyl, 2,6-dithio-3,7-dihydro-benzo(1,2-b:4,5-b')dithiophen-3,7-diyl, 2,7-dioxo-3,8-dihydro-1,6-dioxa-dicyclopenta(b,g)naphthalene-3,8-diyl, 2,7-dioxo-1,6-dihydro-3,8-dioxa-dicyclopenta(a,f)naphthalene-1,6-diyl, 2,7-dioxo-3,8-dihydro-1,6-dioxa-dicyclopenta(a,f)naphthalene-3,8-diyl, substituted 2,6-dioxo-5,7-dihydro-1H,3H-pyrrrolo(2,3-f)indol-3,7-diyl moiety of formula (II), substituted 2,6-dioxo-3,7-dihydro-benzo(1,2-b:4,5-b')difuran-3,7-diyl moiety of formula (III), substituted 2,6-dioxo-5,7-dihydro-1H,3H-pyrrolo(2,3-f)indol-3,7-diyl (IV), substituted-6-thioxo-2-oxo-3,5,6,7-tetrahydro-1H-pyrrolo(2,3-f)indol-3,7-diyl moiety of formula (V) or substituted 2,6-diylidenediamine-5,7-dihydro-1H,3H-pyrrolo(2,3-f)indol-3,7-diyl moiety of formula (VI). The monomer, oligomer or polymer is of formula (PI) or (PII), (where Ar1 and M1-(I)-M2 can be connected in a random or alternating manner, i.e. (PI) or (PII) can be a random copolymer, alternating copolymer or block copolymer), preferably e.g. poly(substituted 3,7-bis-(2-oxo-1,2-dihydro-indol-(3 E)-ylidene)-3,7-dihydro-benzo(1,2-b;4,5-b')difuran-2,6-dione) of formula (XI), poly(substituted 3-(2-oxo-1,2-dihydro-indol-(3E)-ylidene)-7-(2-oxo-6-thiophen-2-yl-1,2-dihydro-indol-(3E)-ylidene)-3,7-dihydro-benzo(1,2-b;4,5-b')difuran-2,6-dione) of formula (XII), poly(substituted 3-(6-(2,2')bithiophenyl-5-yl-2-oxo-1,2-dihydro-indol-(3E)-ylidene)-7-(2-oxo-1,2-dihydro-indol-(3E)-ylidene)-3,7-dihydro-benzo(1,2-b;4,5-b')difuran-2,6-dione) of formula (XIII), poly(substituted 3-(2-oxo-1,2-dihydro-indol-(3E)-ylidene)-7-(2-oxo-6-(2,2';5',2'')terthiophen-5-yl-1,2-dihydro-indol-(3E)-ylidene)-3,7-dihydro-benzo(1,2-b;4,5-b')difuran-2,6-dione) of formula (XIV) or poly(substituted 3-(2-oxo-1,2-dihydro-indol-(3E)-ylidene)-7-(2-oxo-6-thieno(3,2-b)thiophen-2-yl-1,2-dihydro-indol-(3E)-ylidene)-3,7-dihydro-benzo(1,2-b;4,5-b')difuran-2,6-dione) of formula (XV).R, R1a = H or optionally substituted 1-60C hydrocarbyl (e.g. alkyl, alkenyl, alkynyl or aryl (all optionally substituted) or any other suitable group), where all the structure can be further substituted with at least one optionally substituted 1-60C hydrocarbyl (e.g. alkyl, alkenyl, alkynyl, aryl or alkoxy (all optionally substituted), CN, NO2, halo or any other suitable group);a = 1-20;b = 0-20;n = 1-1000000;wavy line = linkage can be cis or trans structure; andAr1 = pi -conjugated moiety, preferably e.g. -CH=CH-, -CC-, benzene-1,4-diyl, pyridin-2,5-diyl, pyrazin-2,5-diyl, (1,2,4,5)tetrazin-3,6-diyl, naphthalene-1,4-diyl, quinoxalin-5,8-diyl, benzo(1,2,5)thiadiazol-4,7-diyl, benzo(1,2,5)oxadiazol-4,7-diyl, thiophen-2,5-diyl, furan-2,5-diyl, thieno(3,2-b)thiophen-2,5-diyl, dithieno(3,2-b;2',3'-d)thiophen-2,6-diyl, 3,4,7,8-tetrathia-dicyclopenta(a,e)pentalen-2,6-diyl, benzo(1,2-b:4,5-b')dithiophen-2,6-diyl, 1,6-dithia-dicyclopenta(b,g)naphthalene-2,7-diyl, thiazol-2,5-diyl, oxazol-2,5-diyl or (1,3,4)thiadiazol-2,5-diyl (all optionally substituted with at least one optionally substituted 1-60C hydrocarbyl, NO2 or halo). Preferred Definitions:    M = phenyl, pyridinyl, pyrazinyl, naphthalenyl, naphthalene-1,2,5,6-tetrayl, (1,5)naphthyridinyl, (2,6)naphthyridin-3,4,7,8-tetrayl, 3a,6a-dihydro-thieno(3,2-b)thiophen-2,3,5,6-tetrayl, anthracen-2,3,6,7-tetrayl, anthracen-1,2,5,6-tetrayl, phenazin-2,3,7,8-tetrayl, phenazin-1,2,6,7-tetrayl or benzo(1,2-b:4,5-b')dithiophen-2,3,6,7-tetrayl (all optionally substituted with at least one optionally substituted 1-60C hydrocarbyl (e.g. alkyl, alkenyl, alkynyl, aryl or alkoxy (all optionally substituted)), CN, NO2, halo or any other suitable group).    EXAMPLE - To a 100 cm3 two-necked round bottom flask were added 0.29 g of (3E,7E)-3,7-bis(6-bromo-1-(2-decyltetradecyl)-2-oxoindolin-3-ylidene)benzo(1,2-b:4,5-b')difuran-2,6(3H,7H)-dione, 0.093 g of 2,5-bis(trimethylstannyl)thiophene and 0.006 g of tri(ortho-tolyl)phosphine. The vessel was evacuated and filled with argon three times. 9 cm3 Of anhydrous chlorobenzene was added and a solution of 3.6 mg of a solution of tris(dibenzylideneacetone)dipalladium in 1 cm3 of chlorobenzene was added with a syringe. The reaction mixture was then heated at 130 degrees C under argon atmosphere for 60 hours. 0.5 cm3 of bromobenzene was added and the reaction mixture was stirred for another 4 hours at 130 degrees C. After cooling down, the reaction mixture was added to 150 cm3 of stirring acetone. The polymer was collected by filtration and purified through Soxhlet extraction using acetone and hexane. The polymer was dissolved sequentially with chloroform and chlorobenzene to obtain 0.158 g, 58% of poly(3-(1-(2-decyl-tetradecyl)-2-oxo-1,2-dihydro-indol-(3E)-ylidene)-7-(1-(2-decyl-tetradecyl)-2-oxo-5-thiophen-2-yl-1,2-dihydro-indol-(3E)-ylidene)-3,7-dihydro-benzo(1,2-b;4,5-b')difuran-2,6-dione) from chloroform extract and 0.093 g, 34% from the chlorobenzene extract.