Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene) Page: 4 of 8

pellet) displays expected bands at 1608, 1440, and 3448 cm' for -COOH vibrations, bands at
1440 and 1196 cm' for -SO3H vibrations, bands at 3060, 1130 and 1046 cm' for Ar-H
vibrations, and bands at 809 and 690 cm1 for phenyl rings in PPP backbone.
The aqueous solution of sulfonated poly(para-phenylene) emits very brilliant blue light
when irradiated by UV light. The emission spectrum of sulfonated PPP aqueous solution is
com ared with the emission spectrum for PPPco2 solution in Figure 2 with the same concentration
(10- M). Figure 3 displayed the photoluminescent spectra of a 100-bilayer-film of self-assembled
PPP and PDDA. It is noticed that the introduction of -SO3H(M) functional groups onto the
polymer backbone caused the blue-shift for either absorption or photoluminescence spectrum.
This phenomenon can be explained with either electron withdrawing effect or interruption of n-
conjugation. It is more likely that the band gaps between conducting band and valence band is
increased by the introduction of negatively charged electron withdrawing group such as -
SO3H(M). Comparing the blue shift effect for aqueous polymer solution, the effect is relatively
small to the modified PPP/PDDA bilayer film. The explanation might be weak spatial interactions
among the PPP layers through the PDDA linker. As shown in Figure 2, the caboxylaed PPP emits
blue light with a maximum intensity at about 430 nm, but the modified PPPso3 with both sulfonate
and carboxylate groups emits very brilliant blue light with maximum intensity at 380 nm and
covered a narrow spectrum range from 355 to 450 nm. The emission spectrum of the 100-bilayer
PDDA/PPP films has the maximum intensity at 411 nm (Figure 3) with a shoulder at about 430
nm.
1.4 50
Sulfonated PPP Solution
1.2
o 40
x
1.0
"N 0.8 PPPCOOK Solution 30
C1
5 0.6 -20
-J
0~
0.4
10
0.2
0.0 0
350 400 450 500 550 600
wavelength(nm)
Figure 2. The solution emission spectra of poly(p-quarterphenylene- 2,2'-
dicarboxylic acid (referred as PPPco3) and Poly(p-quarterphenylene- disulfonic-
dicarboxylic acid(referred as PPPso3).

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Shi, X.; Li, D.Q.; Luett, M.; Fitzsimmons, M.R. & Van Patten, G.P. Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene), report, March 1, 1998; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc706283/m1/4/ocr/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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