Fabrication of Chiral Langmuir−Schaefer Films from Achiral TPPS and Amphiphiles through the Adsorption at the Air/Water Interface
Fabrication of Chiral Langmuir−Schaefer Films from Achiral TPPS and Amphiphiles through the Adsorption at the Air/Water Interface
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DOI：
10.1021/jp026621r
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发表时间：
2003-02
影响因子：
3.3
通讯作者：
Li Zhang;Qing Lu;Minghua Liu
中科院分区：
文献类型：
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作者：
Li Zhang;Qing Lu;Minghua Liu
研究了三种两亲物：十六烷基三甲基溴化铵 (CTAB)、十八烷基胺 (ODA)、双十八烷基二甲基溴化铵 (DOAB) 和四(4-磺基苯基)卟啉 (TPPS) 在空气/水界面上形成的复杂单分子层。结果发现，在pH = 3.1时，TPPS可以通过静电相互作用与空气/水界面上的两亲物形成复杂的单分子层。可以使用 Langmuir-Schaefer (LS) 转移方法将复杂的单层沉积到固体基底上，形成轮廓分明的 LS 薄膜。尽管TPPS在pH 3.1的水溶液中以单体形式存在，但它可以与两亲物在复合单分子层中形成J-聚集体。有趣的是，尽管 TPPS 和两亲物都是非手性的，但 LS 薄膜在圆二色性 (CD) 光谱中表现出强烈的裂棉效应。研究发现，只有当LS薄膜的手性与LS薄膜中TPPS的J聚集体形成有关时，即只有当TPPS形成J聚集体时...
Complex monolayer formation between three amphiphiles: cetyltrimethylammonium bromide (CTAB), octadecylamine (ODA), dioctadecyldimethylammonium bromide (DOAB), and tetrakis(4-sulfonatophenyl)porphine (TPPS) at the air/water interface were investigated. It was found that TPPS could form complex monolayers with the amphiphiles at the air/water interface through the electrostatic interaction at pH = 3.1. The complex monolayer could be deposited onto solid substrates using a Langmuir−Schaefer (LS) transfer method to form well-defined LS films. Although TPPS existed as a monomer in aqueous solution at pH 3.1, it could form a J-aggregate in the complex monolayers with the amphiphiles. It is interesting to note that the LS films showed strong split Cotton effect in the circular dichroism (CD) spectra although TPPS and the amphiphiles are all achiral. It was found that only if the chirality of the LS film was related to the J-aggregate formation of TPPS in the LS film, i.e., only when the TPPS formed J-aggregate...