Patent ID: 7206111

Claim:
A chromophore of the structure wherein, independently at each occurrence, D is an electron donating group having low electron affinity relative to the electron affinity of A; π 1 is absent or a bridge that provides electronic conjugation between D and the thiophene ring; π 2 is absent or a bridge that provides electronic conjugation between A and the thiophene ring; A is an electron accepting group having high electron affinity relative to the electron affinity of D; X 1 is an alkyl linker, an aryl linker, a heteroalkyl linker, or nothing; R is alkyl, aryl, heteroalkyl or heteroaryl; R 1 is alkyl, aryl, or heteroalkyl when X 1 =nothing with the additional proviso that R 1 can be hydrogen if X 1 =an alkyl, aryl, or heteroalkyl linker; n=1–4; and any one of π 1 , π 2 , D, or A can be further independently substituted with one or more halogen, alkyl, aryl, or heteroalkyl.