强聚电解质对离子型芘衍生物探针的键合

由于芘单线态寿命长 ,单体态发射光谱精细结构对微环境极性敏感 ,在特定的环境下能形成激基缔合物 ,而且可作为非辐射能量转移过程的受体 ,因而被广泛应用于水溶性聚合物的研究 1～ 3] .芘微溶于水 ,可以作为自由“探针”加入体系探测环境极性的变化与疏水微区的形成 .而离子型的芘衍生物由于良好的水溶性 ,可以同相反电荷的聚电解质发生静电键合 ,最近已经被用来研究聚电解质多层膜的结构 4 ] .但是芘的离子衍生物同聚电解质键合的规律还不是十分清楚 ,例如聚电解质的电荷密度和化学结构对键合的影响 ,尤其是键合的化学计量关系 ,这对芘…

Binding of Ionic Derivative of Pyrene to Strong Polyelectrolyte

Binding of pyrene probe cation of 1 pyrenemethylamine hydrochloride(PyMeAH +) to sulfonate polyelectrolyte PAMPS in aqueous solution was investigated by the relative fluorescent intensity I E/ I M of the excimer to monomer. The saturation amount of repeat unit AMPS for the polyelectrolyte bound to one PyMeAH + ion was about 2 5 estimated from the maximum on the curve of I E/ I M vs. the probe concentrations. The increase of the ionic strength of the solution by adding salt or excess alkali ions of 10 -4 mol/L greatly reduced the I E/ I M value. This fact suggested that the probe cation PyMeAH + form a loose ion pair with the sulfonate anion on the polyelectrolyte.