摘要
The fluorescent spectra of two series of sulfonated polyelectrolytes respectively labeled with dansyl and pyrenyl groups were determined as a function of volume fraction φ THF of THF in DMSO/THF mixed solvents. When φ THF 0.65, the maximum wavelength λ em and the intensity R F relative to that in DMSO for a band of dansylated samples, as well as I 1/I 3 for pyrene labeled samples varied slightly with increasing φ THF , indicating the capability of polyelectrolyte to maintain its chain solvation stable.As long as φ THF beyond 0.70, there was an abrupt drop in R F and λ em showing the sudden change in the chain solvation layer. I 1/I 3 decreased with an increase in the charge density of polyelectrolyte samples,suggesting the existence of aggregated structure even in pure DMSO.
The fluorescent spectra of two series of sulfonated polyelectrolytes respectively labeled with dansyl and pyrenyl groups were determined as a function of volume fraction φ THF of THF in DMSO/THF mixed solvents. When φ THF 0.65, the maximum wavelength λ em and the intensity R F relative to that in DMSO for a band of dansylated samples, as well as I 1/I 3 for pyrene labeled samples varied slightly with increasing φ THF , indicating the capability of polyelectrolyte to maintain its chain solvation stable.As long as φ THF beyond 0.70, there was an abrupt drop in R F and λ em showing the sudden change in the chain solvation layer. I 1/I 3 decreased with an increase in the charge density of polyelectrolyte samples,suggesting the existence of aggregated structure even in pure DMSO.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2000年第5期450-453,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金!(29804003)
国家杰出青年科学基金!(29725411)资助项目
关键词
丹磺酰胺
芘
溶剂化
荧光光谱
强聚电解质
Dansyl,Pyrene,Polyelectrolyte, Solvation, Fluorescent spectra
