The efficient preparation of carbazole-based conjugated porous polymer films using electrochemical method and their fluorescence property study

Poly(2,7-bis(carbazol-9-yl)-9,9-dimethylfluorene) (PBCMF) polymer with porous structure was fabricated, and its electropolymerization was studied comparatively in dichloromethane (CH2Cl2) systems in the presence of different contents of boron trifluoride diethyl etherate (BFEE). When adding BFEE in CH2Cl2 solution, the oxidation potential of BCMF could be decreased obviously. When the content of BFEE increased to 40%, BCMF was oxidized at 0.47 V, while it was oxidized at 1.07 V in pure CH2Cl2 solution. A series of experiments showed that the polymer PBCMF films could be easily obtained in CH2Cl2-BFEE systems, and films obtained from the 40 vol% BFEE system showed best electrochemical behavior and best fluorescence property. Fourier transform infrared spectra and UV-Vis proved the longer conjugated chains of polymers. And scanning electron microscopy images of polymer films showed that all these polymer films made from BFEE systems had a good porous structure.