Influence of Surfactants on the Aggregation Behavior of Water-Soluble Dendritic Phthalocyanines
Influence of Surfactants on the Aggregation Behavior of Water-Soluble Dendritic Phthalocyanines
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DOI：
10.1021/ma9919110
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发表时间：
2000-03
期刊：
影响因子：
5.5
通讯作者：
Xiyou Li;Xu He;A. Ng;Chi Wu;D. Ng
中科院分区：
文献类型：
--
作者：
Xiyou Li;Xu He;A. Ng;Chi Wu;D. Ng
研究了一系列末端含羧酸根的水溶性树枝状酞菁与表面活性剂在水介质中的相互作用。吸收光谱和荧光光谱表明，阳离子表面活性剂比中性和阴离子表面活性剂能更有效地破坏酞菁的分子聚集，特别是对第一代大环化合物。的相互作用主要是静电的性质，所产生的表面活性剂的阳离子头和树枝状聚合物的阴离子表面，这已被支持的荧光猝灭实验，使用阳离子卟啉（TMePyP）4+作为猝灭剂。第一代树枝状酞菁和阳离子表面活性剂CTAB之间的复合物的形成也已监测到动态激光光散射在0.01摩尔dm-3的NaBr水溶液介质中。随着CTAB浓度的增加，聚集体的表观平均流体动力学半径增大。
The interactions of a series of water-soluble dendritic phthalocyanines containing terminal carboxylate functionality with a range of surfactants in aqueous media have been investigated. Cationic surfactants, as compared with neutral and anionic counterparts, are much more effective to disrupt the molecular aggregation of phthalocyanines, in particular for the first generation macrocycle, as demonstrated by the absorption and fluorescence spectroscopy. The interactions are mainly electrostatic in nature, arising from the cationic head of the surfactant and the anionic surface of the dendrimers which has been supported by the fluorescence quenching experiments using the cationic porphyrin (TMePyP)4+ as the quencher. The complex formation between the first generation dendritic phthalocyanine and the cationic surfactant CTAB has also been monitored by dynamic laser light scattering in 0.01 mol dm-3 NaBr aqueous media. As the concentration of CTAB increases, the apparent average hydrodynamic radius of the agg...