Substituent Effects of Porphyrins on Structures and Photophysical Properties of Amphiphilic Porphyrin Aggregates

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• 作者：Kohei Hosomizu ; Masaaki Oodoi ; Tomokazu Umeyama ; Yoshihiro Matano ; Kaname Yoshida ; Seiji Isoda ; Marja Isosomppi ; Nikolai V. Tkachenko ; Helge Lemmetyinen ; Hiroshi Imahori
• 刊名：Journal of Physical Chemistry B
• 出版年：2008
• 出版时间：December 25, 2008
• 年：2008
• 卷：112
• 期：51
• 页码：16517-16524
• 全文大小：314K
• 年卷期：v.112,no.51(December 25, 2008)
• ISSN：1520-5207

文摘

Substituent effects of porphyrin on the structures and photophysical properties of the J-aggregates of protonated 5-(4-alkoxyphenyl)-10,15,20-tris(4-sulfonatophenyl)porphyrin have been examined for the first time. Selective formation of the porphyrin J-aggregate was attained when suitable length of the alkoxy group was employed for the amphiphilic porphyrin. Namely, a regular leaflike structure was observed for the J-aggregates of protonated 5-(4-octyloxyphenyl)-10,15,20-tris(4-sulfonatophenyl)porphyrin, which was consistent with the results obtained by using the UV−visible absorption and dynamic light-scattering measurements. A bilayer structure in which the hydrophobic alkoxyl groups facing inside the bilayer are interdigitated to each other, whereas the hydrophilic porphyrin moieties are exposed outside, was proposed to explain the unique porphyrin J-aggregate. Fast energy migration and efficient quenching by defect site in the J-aggregates were suggested to rationalize the short lifetimes of the excited J-aggregates.