| abstract |
Poly(5, 5'-bis(thiophen-2-yl)-benzo[2, 1-b; 3, 4-b']dithiophene) comprising as repeating units the group of the formula (I) wherein R is independently selected from (a) a C1-20 alkyl group, (b) a C2-20 alkenyl group, (c) a C2-20 alkynyl group, (d) a C1-20 alkoxy group, (e) a -Y-C3-10 cycloalkyl group, (f) a -Y-C6-14 aryl group, (g) a-Y-3-12 membered cycloheteroalkyl group, or (h) a -Y-5-14 membered het-eroaryl group, wherein each of the C1-20 alkyl group, the C2-20 alkenyl group, the C2-20 alkynyl group, the C3-10 cycloalkyl group, the C6-14 aryl group, the 3-12 membered cycloheteroalkyl group, and the 5-14 membered heteroaryl group is optionally substituted with 1-4 R1 groups, R1 is independently selected from (a) a S(O)m-C1-20 alkyl group, (b) a S(O)m-OC1-20 alkyl group, (c) a S(O)m-OC6-14 aryl group, (d) a C(O)-OC1-20 alkyl group, (e) a C(O)-OC6-14 aryl group, (f) a C1-20 alkyl group, (g) a C2-20 alkenyl group, (h) a C2-20 alkynyl group, (i) a C1-20 alkoxy group, (j) a C3-10 cycloalkyl group, (k) a C6-14 aryl group, (l) a 3-12 membered cycloheteroalkyl group, or (m) a 5-14 membered heteroaryl group, Y is independently selected from a divalent C1-6 alkyl group, or a covalent bond; and m is independently selected from 0, 1, or 2, and having a number average molecular weight Mn in the range of from 5,000 to 200,000 g/mol. |