Abstract: Conjugated polymers are increasingly concernful as the emerging semiconductors due to their low cost, ease of processing, flexibility and excellent optic-electro properties. In this paper, two novel polymeric photovoltaic materials on the basis of fluorene having fluoren-9-one and fluoren-9-units in the main chain were synthesized. The polymers were characterized via FTIR and NMR. The polymers possess a satisfactory thermal stability and machinability with thermal decomposition temperature(T_d) of 461.2 and 448.1 ℃ and glass-transition temperature(T_g) of 122.4 and 146.6 ℃, respectively. The materials perform a good absorption around about 300—700 nm covering a large part of the visible spectrum. Their effective reversibilities of redox reaction were determined, and the polymers exhibited a correspondingly low bandgap of 1.94 and 1.86 eV detected by cyclic voltammetry(CV). Therefore, these polymers will be potential light-absorbing and electro-transport materials applied in organic photovoltaic devices.

Key words: Polyfluorene, Fluorenone, Dicyanomethylenefluorene, Suzuki coupling reaction