Abstract
Novel polyazomethines containing a N-hexylphenoxazine electron donor (D) unit and various electron acceptor (A) moieties were developed. The D–A polymers were successfully synthesized by polycondensation of 2,5-bis(p-aminophenyl)-1,3,4-oxadiazole, 4,4′-(9-fluorenylidene)dianiline, or 2,7-diaminofluorene with N-hexylphenoxazine-3,7-dicarbaldehyde, under friendly conditions. The polymer processing conditions promoted different self-assemblies during evaporation that, in turn, definitely exerted a drastic influence on the photophysical behavior of polymers. Electronic absorption, fluorescence, and electrochemistry measurements revealed that the electron-withdrawing subunit directly connected to the phenoxazine core facilitates the charge transfer character and induces a fine-tuning of HOMO–LUMO energy levels. We brought evidence, for the first time, that polaron generation in pristine, undoped films of polyazomethines is achievable. Also, it was found that fluorescence quantum yields could be tailored with o...
Published Version
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