Conformation of Polyelectrolyte Chains with Sulfonate Groups Observed with Fluorescent Nonradiative Energy Transfer

Abstract

Abstract: Strong polyelectrolytes were prepared by copolymerization of 2-acrylamido-2-methylpropane sulfonic acid(AMPS) from 5% to 99%(charge densities) with N,N-dimethylacrylamide and lightly labeled by naphthalene and pyrene, respectively. The overlap mass concentration ρ^* determined by intermolecular nonradiative energy transfer(NRET) decreased from 0.55 to 0.25 g/L with increasing the charge density of the samples and was about one order of magnitude smaller than that determined from the relative excimer emission. With increasing the charge density in dilute aqueous solution, the intermolecular NRET was first weakened till the charge density of about 30% and then enhanced. This phenomenon can be qualitatively interpreted in the framework of Manning′s theory for counterion condensation and aggregation of highly charged polyelectrolytes.

Key words: Polyelectrolyte, Nonradiative energy transfer, Overlap concentration, Counterion condensation, Aggregation

CLC Number:

O631

TrendMD:

SUN Qi-Long, WANG Chao-Yang, REN Bi-Ye, TONG Zhen, LIU Xin-Xing, ZENG Fang, LIU Ping . Conformation of Polyelectrolyte Chains with Sulfonate Groups Observed with Fluorescent Nonradiative Energy Transfer[J]. Chem. J. Chinese Universities, 2003, 24(7): 1302.

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Conformation of Polyelectrolyte Chains with Sulfonate Groups Observed with Fluorescent Nonradiative Energy Transfer

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