J-Aggregation of a Water-Soluble Tetracationic Porphyrin in Mixed LB Films with a Calix[8]arene Carboxylic Acid Derivative
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- 作者：Gustavo de Miguel ; Marta Pé ; rez-Morales ; Marí ; a T. Martí ; n-Romero ; Eulogia Muñ ; oz ; Tim H. Richardson ; Luis Camacho
- 刊名：Langmuir
- 出版年：2007
- 出版时间：March 27, 2007
- 年：2007
- 卷：23
- 期：7
- 页码：3794 - 3801
- 全文大小：281K
- 年卷期：v.23,no.7(March 27, 2007)
- ISSN：1520-5827
文摘
The molecular organization of a mixed film, containing a water-soluble tetracationic porphyrin (TMPyP) and ap-tert-butyl calix[8]arene octacarboxylic acid derivative (C8A), at the air-water interface and on a solid support (LBfilm), has been investigated. Although the TMPyP aggregation was not detected at the air-water interface, TMPyPJ-aggregates have been found in the LB films (Y-type). Unlike tetraanionic porphyrins, for example TSPP, the TMPyPJ-aggregates are not induced by a zwitterion formation. The TMPyP J-aggregation is a result of a "double comb"configuration, where porphyrins from opposite layers are interwoven in a linear infinite J-aggregate. Our resultsconfirm that TMPyP molecules tend to self-aggregate strongly, provided the electrostatic repulsions of their peripheralgroups are cancelled by the anionic groups of the C8A matrix.