Method of producing benzo[1,2-b:4,5-b']dithiophene and benzothiadiazole-based molecular complexes

A method comprising:

• reacting 5-chloro-2,1,3-benzothiadiazole with N-bromosuccinimide to produce 4,7-dibromo-5-chlorobenzo[c][1,2,5]thiadiazole;
• reacting 4,7-dibromo-5-chlorobenzo[c][1,2,5]thiadiazole with trimethyl[4-(2-octyldodecyl)thiophen-2-yl]stannane to produce 5-chloro-4,7-bis(4-(2-octyldodecyl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole;
• synthesizing 4,7-bis(5-bromo-4-(2-octyldodecyl)thiophen-2-yl)-5-chlorobenzo[c][1,2,5]thiadiazole from 5-chloro-4,7-bis(4-(2-octyldodecyl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole;
• reacting 4,7-bis(5-bromo-4-(2-octyldodecyl)thiophen-2-yl)-5-chlorobenzo[c][1,2,5]thiadiazole with tributyl(thiophen-2-yl)stannane to produce 4-bromo-5,6-difluoro-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazole;
• reacting 4,7-dibromo-5-chloro-2,1,3-benzothiadiazole with tributyl(thiophen-2-yl)stannane to produce 4-bromo-5-chloro-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazole;
• reacting trimethyl[4-(2-octyldodecyl)thiophen-2-yl]stannane and 4-bromo-5-chloro-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazole to produce 5-chloro-4-(4-(2-octyldodecyl)thiophen-2-yl)-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazole;
• reacting 5-chloro-4-(4-(2-octyldodecyl)thiophen-2-yl)-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazole with N-bromosuccinimide to produce the co-monomer 4-(5-bromo-4-(2-octyldodecyl)thiophen-2-yl)-7-(5-bromothiophen-2-yl)-5-chlorobenzo[c][1,2,5]thiadiazole;
• and
• coupling 4,8-bis(5-(2-butyloctyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)bis(trimethyl stannane to 4-(5-bromo-4-(2-octyldodecyl)thiophen-2-yl)-7-(5-bromothiophen-2-yl)-5-chlorobenzo[c][1,2,5]thiadiazole to produce poly(4-(5-(4,8-bis(5-(2-butyloctyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophen-2-yl)thiophen-2-yl)-5-chloro-7-(4-(2-octyldodecyl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole).