Syntheses Of 7-fluoro-6-(thiophen-2-yl)-4h-thieno32-bindole-based Polymers

Four high band gap donor polymers and one medium band gap terpolymer were synthesized using 2-bromo-6-(5-bromothiophen-2-yl)-4-(2-ethylhexyl)-7-fluoro-4H-thieno[3,2-b]indole (34), 2-bromo-6-(5-bromothiophen-2-yl)-7-fluoro-4-octyl-4H-thieno[3,2-b]indole (36), 2-bromo-6-(5-bromothiophen-2-yl)-4-decyl-7-fluoro-4H-thieno[3,2-b]indole (38), 2-bromo-6-(5-bromothiophen-2-yl)-7-fluoro-4-(2-(2-methoxyethoxy)ethyl)-4H-thieno[3,2-b]indole (43) , (4,8-bis(4,5-dioctylthiophen-2-yl)benzo[1,2-b:5,4-b']dithiophene-2,6-diyl)bis(trimethyl-stannane)(44) as electron donors and 4,7-dibromo-5,6-difluorobenzo[c][1,2,5]thiadiazole (45) as electron acceptor, by using the Stille polymerization reaction. These polymers have good solubility in chloroform and were characterized by using UV-Vis spectroscopy and cyclic voltammetry. All monomers and intermediate compounds were characterized by using infrared and NMR spectroscopy.

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