Low bandgap polymers from fused dithiophene diester

Abstract

The present invention involves monomeric compounds having the structure: ##STR1## Substituents W and Z are independently --CN, --NO 2 , -aryl, -aryl-V, --COX, SO 2 R, --H, or -alkyl. Substituent X is --OR, or --NR,R where R and R 1 are independently -alkyl or --H. Substituent V is -halide, --NO 2 , --CN …