Patent ID: 7737247

Claim:
A polymer, comprising: units derived from thieno[3,4-b]furan according to the structures (I), (II), or (III): wherein R a is hydrogen, hydroxyl, C 6 -C 12 aryl, C 3 -C 10 cycloalkyl, C 1 -C 12 alkyl, halogen, C 1 -C 12 alkoxy, C 1 -C 12 alkylthio, C 1 -C 12 haloalkyl, C 1 -C 12 haloalkoxy, C 6 -C 12 haloaryl, pyridyl, cyano, thiocyanato, nitro, amino, C 1 -C 12 alkylamino, C 1 -C 12 aminoalkyl, acyl, sulfoxyl, sulfonyl, sulfonate, phosphonate, amido, or carbamoyl.