Tuning J-Aggregates of Tetra(p-hydroxyphenyl)porphyrin by the Headgroups of Ionic Surfactants in Acidic Nonionic Micellar Solution

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• 作者：Xiwen Li ; Zhongliang Zheng ; Mingyue Han ; Zhangping Chen ; Guolin Zou
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：May 3, 2007
• 年：2007
• 卷：111
• 期：17
• 页码：4342 - 4348
• 全文大小：136K
• 年卷期：v.111,no.17(May 3, 2007)
• ISSN：1520-5207

文摘

J-aggregates of the diacid form of tetra(p-hydroxyphenyl)porphyrin (THPP) were found to be stable in nonionicmicellar solution in the presence of trace ionic surfactant with an oxyacid headgroup. The excitation energyof exciton coupling depends systematically on the headgroups of the ionic surfactant, by which strong andweak coupling can be accomplished in the J-aggregates. The J-aggregates have two strong exciton bandscorresponding to the B- and Q-bands of the protonated monomers. The total fluorescence of THPP is quenchedthrough aggregate formation. A strong and sharply peaked resonance light-scattering signal that suggests adelocalized excitonic state was observed just slightly to the red of the absorption maximum of the J-aggregates.The overall resonance Raman intensities appeared to be stronger in the aggregates than in the monomers. Inthe kinetics of aggregation induced by sodium dodecyl sulfate (SDS), no characteristics of autocatalyzedreactions were observed, and there was only a logarithmic phase that lasted only several seconds.