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Abstract
New donor−acceptor copolymers PBDP-36CZ and PBDP-27CZ incorporating both the electron-withdrawing benzodipyrrolidone (BDP) unit and the strong electron-donating carbazole unit were synthesized via Suzuki cross coupling with Pd(dppf)Cl2 as the catalyst. The photophysical and electrochemical properties of the resulting polymers were fully characterized. The UV-Vis absorption spectra showed that both PBDP-36CZ and PBDP-27CZ possess obvious intramolecular charge transfer (ICT) transition absorption and the maxima of absorption wavelength in chloroform were at 511 and 517 nm for PBDP-36CZ and PBDP-27CZ, respectively, while the monomer BDP exhibited an absorption maximum at 468 nm. Further, the low energy gaps of the polymers PBDP-36CZ and PBDP-27CZ, estimated from their electrochemical curves, were 1.83 eV and 1.53 eV, respectively.
Funding
We wish to thank the National Natural Science Foundation of China (NSFC) (No. 20804022), the National Undergraduate Innovation Program of China (No. 201410426040) and the Natural Science Foundation of Shandong Province (No. ZR2011BM001) for financial support of this research.