<Abstrate>

A series of conducting copolymers including fluorene (F) and

3-hexylthiophene (3HT) were synthesized in chloroform via

chemical oxidative polymerization with FeCl₃. The incorporation

of 3HT and fluorene units into the resultant polymer main chain

was verified via proton nuclear magnetic resonance (¹H NMR)

and matrix-assisted laser desorption/ionization mass spectrometry.

During copolymerization, the molar ratios of fluorene and thiophene

changed (0 to 100%). Thus, the fluorene content in the copolymers

was proportional to that of the fluorene fed into the polymerization

reaction mixture. Ultraviolet–visible (UV–Vis) and fluorescence

spectra indicated that the absorption and emission peak wavelengths

of the resulting copolymer were significantly affected by the fluorene

content. The quantum yield determined using the relative method

increased from 0.26 to 0.73 with an increase in the fluorene content.

The thermal stability of the copolymers also improved with the

presence of fluorene.

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