Macromolecules, Vol. 37, No. 3, 2004
Synthesis and Properties of Polyoxadiazole Derivatives 733
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spectra of P 1, P 3 with two oxadiazole rings per repeated
unit brings about a red shift in absorption maxima and
a blue shift in PL maxima. P 1-P 3 display obvious blue
shifts in trifluoroacetic acid/chloroform solutions. How-
ever, P 9 is bathochromic when protonated with tri-
fluoroacetic acid in chloroform solutions. Electrochemi-
cal analysis through cyclic voltammetry demonstrates
that these copolymers containing electron-accepting
oxadiazole rings decrease the LUMO level significantly.
The Eonset of P 9 with the fluorene rings in the backbone
is higher than that of P 6 having the distyrylbenzene
rings due to the increase of electron affinity after the
fluorene ring is introduced into the polymer backbone.
The electrochemical band gap calculated from the onset
of the reduction and oxidation process show great
discrepancy with the optical band gap calculated from
the absorption edges due to donor-acceptor feature of
the dioxadiazole unit.
Ack n ow led gm en t. We thank the National Science
Council of the Republic of China for financial aid
through project NSC 90-2216-E006-036.
Su p p or tin g In for m a tion Ava ila ble: Experimental de-
tails and characterization of monomers (6, 14, 21, 26, 29) and
copolymers (P 1-P 9), 1H NMR spectrum (400 MHz, CDCl3) of
compound 26, absorption and PL spectra of P 1-P 9 in solution
or film state, and reduction CV curves of P 1-P 9. This material
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