π-Electron Systems Containing 3,3'-Bithiophene as a Key Skeleton (3,3'- EL ) α,α' α,α' β,β' β,β' (3,3' β,β' ) β,β' α- β X 3,3'- α 3,3'- β,β' β,β' β,β' 3,3'- 7 pKR + 3,3' 3,3'3,3' pH pKa 700 nm 1100 nm 1600 nm 3,3'5 β,β'
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