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Self-Organization of Bilayr-Forming Crystals

双层形成晶体的自组织

基本信息

批准号：
04680053
负责人：
OKUYAMA Kenji
金额：
$ 1.15万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

The purpose of this research project is to understand the fundamental aggregation principle when amphiphile molecules organize spontaneously in solution by themselves. To do this, the relationship between chemical structures and bilayr structures of azobenzene-containing amphiphiles C_nAzoC_mN^+Br^- were thoroughly investigated by the systematic change of alkyl chain lengths, m and n.Following results were obtained. (1) For the compounds with m-n<greater than or equal>2, azobenzene chromophores are parallely arranged in a side by side fashion and amphiphile molecules from both sides of a bilayr interdigitate each other. This packing mode was called "H-aggregate" structure. Especially, the compounds with m-n=2 were crystallized and their structures were analyzed precisely. Although cast films of compounds with m-n<greater than or equal>2 showed H-aggregation structure, their stability decreased with the increase of the difference (m-n) from 2. (2) In the case of compounds with m=5, azob … More enzene chromophores are arranged in a head to tail fashion and amphiphile molecules tilt by about 30ﾟ to the bilayr surface. This packing mode was called "J-aggregate" structure. This group of compounds was easy to crystallize and every specimen was analyzed to get precise bilayr structures. (3) Every compound with different m and n showed a crystal-crystal transition at elevated temperature and their structures at higher temperature seemed to be similar to the J-aggregation structure, independent on their original aggregation structures. (4) From the above experimental results the following conclusions were obtained. The cross-section balance between the hydrophobic part and the hydrophilic part is most important as a driving force in the formation of bilayr structures. The bilayr structure was controlled by changing the number of carbon atoms in the tail (n) and the spacer (m) part. Moreover, in the case of H-aggregation state, small structural differences could be controlled by the odd or even Less

本研究计划的目的是了解两亲分子在溶液中自发组织时的基本聚集原理。为此，我们通过烷基链长m和n的系统变化，深入研究了含偶氮苯的两亲分子C_nAzoC_mN^+Br^-的化学结构与双层结构之间的关系，得到了以下结果。(1)对于m-n2的化合物<greater than or equal>，偶氮苯发色团以并排方式平行排列，双层两侧的两亲分子相互交叉。这种堆积方式被称为“H-聚集体”结构。特别是对m-n=2的化合物进行了结晶，并对其结构进行了精确的分析。m-n值为2的化合物的流延膜虽然<greater than or equal>呈现H-聚集结构，但其稳定性随着m-n值与2之差的增大而降低。(2)在m=5的化合物的情况下， ...更多信息苯发色团以头对尾的方式排列，两亲分子向双层表面倾斜约30 °。这种堆积方式被称为“J-聚集体”结构。这组化合物易于结晶，并对每个样品进行分析以获得精确的双层结构。(3)具有不同m和n的每种化合物在高温下都表现出晶体-晶体转变，并且它们在较高温度下的结构似乎类似于J-聚集结构，与它们的原始聚集结构无关。(4)从上述实验结果中得出以下结论。疏水部分和亲水部分之间的横截面平衡作为双层结构形成的驱动力是最重要的。双层结构通过改变尾部（n）和间隔区（m）部分的碳原子数来控制。此外，在H-聚集态的情况下，小的结构差异可以由奇数或偶数Less控制，