Structural and Optical Controls of Mesoscopic Supramolecular Aggregates by the Function of an Interface of Two Phases

通过两相界面的作用对介观超分子聚集体进行结构和光学控制

基本信息

批准号：
12640563
负责人：
YAO Hiroshi
金额：
$ 2.37万
依托单位：
Himeji Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The J aggregates of a pseudoisocyanine (PIC) dye were formed at a mica/aqueous solution interface and showed characteristic optical features. The J aggregates at various dye concentrations were in situ observed in solution by atomic force microscopy (AFM), and they were elucidated to possess three-dimensional domain island structures for the first time. Because the absorption peak wavelength, line width, or fluorescence lifetime was independent of the growth processes of the aggregates, the physical aggregation size (>〜10^6 molecules) is suggested to be much larger than the coherence size at room temperature.Aqueous mixed solutions of PIC and its structural analogous asymmetric cyanine (AC) dye formed amalgamated J aggregates at a mica/solution interface, and the formation mechanism of the aggregates was clarified by determining the optical, structural, and morphological properties of such aggregates. The florescence microscopy system constructed in our laboratory showed that the emissive amalgamated J aggregates possessed mesoscopic island domain morphology. The J aggregates covered the interface completely while the AC mole fraction was small. With increasing the AC mole fraction, the emissive J aggregate islands decreased in size and number and were discretely distributed, although AFM showed that the interface was still completely covered by adsorbed molecules. For the first time, our results show that dye adsorption from PIC/AC mixture solutions generated two types of island domain formation at the mica/solution interface (mesoscopic phase separation) : emissive amalgamated J aggregate island (PIC rich domain) and non-emissive island in the absence of J aggregates (AC-rich domain).

伪异氰酸（PIC）染料的J聚集体是在微/水溶液界面上形成的，并显示了特征光学特征。通过原子力显微镜（AFM）在溶液中观察到各种染料浓度的J聚集体，并首次阐明它们具有三维域岛结构。由于吸收峰值波长，线路宽度或荧光寿命与聚集体的生长过程无关，因此，建议的物理聚集大小（> 〜10^6分子）被认为比室温下的相干大小要大得多。通过确定此类骨料的光学，结构和形态特性来阐明聚集体的机理。在我们的实验室中构建的荧光显微镜系统表明，发射的合并J骨料具有介观岛结构域形态。当交流分子分数很小时，J骨料完全覆盖了界面。随着交流分子级分的增加，发射的J骨料岛的大小和数量减小，并且分布分布，尽管AFM表明该界面仍然被吸附的分子完全覆盖。我们的结果首次表明，PIC/AC混合溶液中的染料吸附在MICA/溶液界面（介镜相分离）下产生了两种类型的岛屿结构域形成：在缺乏J聚集物（AC-Richain）的情况下，发射的合并J骨料聚集岛（PIC Rich rone域）和非隔离岛。