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Empirical observation and quantum chemical explanation of a likely common but “overlooked” outcome of the donor–acceptor (D–A) approach to organic electronic materials are reported. The frontier molecular orbitals (FMOs) of D–A copolymers prepared from the amidated Pechmann dye unit (APD) are dictated primarily by this “acceptor,” largely because its HOMO–LUMO gap falls within the gaps of common “donor”...
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