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fully synthesized through a postpolymerization ap-
proach. Two traditional polymerization techniques,
Gilch and Wittig reactions, were employed and found
to produce two types of polymers structures, in which
trans- or cis-vinyl was the dominant composition, re-
spectively. Although the Gilch product P 1 was insoluble
in common organic solvents, its interesting acid-assisted
and reversible solubility make it very promising for
application as green emissive material in light-emitting
diodes. Increase of hydrophilicity of the side chains was
found to be beneficial to water solubility of the polymers.
The optical properties of P 1 were studied, which showed
a solvent-dependent conjugation length. Quaterizaition
also resulted in the more twisted conformation of the
polymer main chain. The conformation change may be
responsible for the decrease in quantum efficiency of the
polymers in solution. The bulky phenyl rings success-
fully suppressed interchain interactions, as evidenced
by the absence of intermolecular dimer and excimer.
Quenching studies showed that efficient fluorescence
quenching can be achieved by using an anionic quencher
Fe(CN)64-, which is very useful in chemo- and biosensor
applications. However, a modified Stern-Volmer plot
demonstrated that some of the fluophores cannot be
accessible to the quencher, probably due to a twisted
conformation or intermolecular aggregation.
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Ack n ow led gm en t. This work was financially sup-
ported by Shanghai Commission of Science and Tech-
nology under Grants 022261042 and 0216nm040. Qu-
Li Fan thanks the National University of Singapore and
the Institute of Materials Research and Engineering
(IMRE) for a research scholarship and top-up award.
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Su p p or tin g In for m a tion Ava ila ble: Experimental de-
tails and characterization of compounds 1-15 and monomers
1-4. This material is available free of charge via the Internet
at http://pubs.acs.org.
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is the integration of the peaks at 0.5-2.0 ppm, and I6.0-8.0 is
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4-
by Fe(CN)6 showed that 50% quenching was achieved at
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7-8 phenyl rings in the polymer backbone per quencher.
4-
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of 2.5 µM P 3′ in water used in the quenching study.
MA030093F