Abstract
A novel polyfluorene having an N-alkylimine group at 9-position, P1, was synthesized through Suzuki-Miyaura coupling polymerization with bis(pinacolato)diboron. This polymer showed good solubility in common organic solvents such as dichloromethane, chloroform, tetrahydrofuran and toluene. Moreover, this polymer exhibited good film-forming ability. The alternating copolymer, P2, was also synthesized by Suzuki-Miyaura coupling polymerization with 9,9-dioctylfluorene-2,7-diboronic acid (1,3-propandiol) ester. These polymers exhibited characteristic optical behaviors. The absorption spectrum of P2 showed intramolecular charge transfer interaction due to the existence of the imine electron-acceptor moiety at 9-position and showed green fluorescence both in organic solvent and in film. Interestingly, the absorption spectra of P1 film were bathochromically shifted relative to those measured in solution.
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