Fluorescence Spectra of Pyrene Labeled Polyelectrolytes with Sulfonate Groups in Water and DMSO

Abstract

Abstract: Pyrenylmethyl methacrylamide(PyMA) was synthesized, and applied to copolymerizing with AMPSand DMAAto get a series of pyrene labeled polymers with sulfonate groups. The molar fraction of sulfonate monomer AMPSin these samples varies from 0.0326 to 0.896 . In DMSOand water, the profile of fluorescence spectrum of pyrene labeled polyelectrolytes is analogous to that of PyMAwhen F_AMPS < 0.449, while the [0,1] emission peak abruptly increased as F_AMPS ≥0.449. The so called polarity scale of pyrene, I₁/ I3 of pyrene labeled polyelectrolytes in DMSOand in water decreases gradually with increasing F_AMPSrepresenting the charge density of the samples. I₁/ I3 also decreases gradually with the increase in polymer concentration in water. The results imply that there exists the hydrophobic aggregation through locally electrostatic attraction even in polyelectrolyte/polar solvent system, in contrast to the traditional polyelectrolyte theory. However, I₁/ I3 of these polyelectrolytes remains almost a constant with increasing NaCl concentration of aqueous solution up to 0.75 mol/L, indicating the electrostatic attraction cannot be simply screened.

Key words: Polyelectrolyte, Fluorescence spectrum, Pyrene, Micropolarity

CLC Number:

O631

TrendMD:

GAO Feng, YAN Yu, REN Bi-Ye, TONG Zhen. Fluorescence Spectra of Pyrene Labeled Polyelectrolytes with Sulfonate Groups in Water and DMSO[J]. Chem. J. Chinese Universities, 2000, 21(6): 976.

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Fluorescence Spectra of Pyrene Labeled Polyelectrolytes with Sulfonate Groups in Water and DMSO

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