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. Author manuscript; available in PMC: 2012 Aug 26.
Published in final edited form as: J Am Chem Soc. 2012 Apr 24;134(18):7803–7811. doi: 10.1021/ja300176w

Figure 4.

Figure 4

(A) pH dependence of the fluorescence intensity ratio of PDPA-TMR1, PDPA-TMR3 and PDPA-TMR6 aqueous solutions at different pHs to pH 7.4. Copolymer concentrations were at 200 μg/mL and maximum emission intensity was measured at 580 nm. (B) The UV-Vis absorbance spectra with normalization to the monomer peak intensity of PDPA-TMR1, PDPA-TMR3 and PDPA-TMR6 in aqueous solution at pH 7.4 and 5.5. Copolymer concentrations were at 200 μg/mL and free TMR dye concentration was at 1.0 μg/mL. (C) Fluorescence intensity ratio of pH 5.5 to 7.4 as a function of weight percentage of PDPA-TMR1, PDPA-TMR3 and PDPA-TMR6 over their dye-free precursors (PDPA-AMAn=1,3,6), respectively. (D) Fluorescence emission spectra of PDPA-CMN, PDPA-BDY and their molecular mixture with 1:1 weight ratio at pH 7.4. The samples were excited at CMN wavelength (λex =408 nm). Each copolymer concentration was controlled at 200 μg/mL.