Design and interfacial assembly of a new series of gemini amphiphiles with hydrophilic poly(ethyleneamine) spacers.
Design and interfacial assembly of a new series of gemini amphiphiles with hydrophilic poly(ethyleneamine) spacers.
复制标题
DOI：
10.1021/jp067287s
复制
发表时间：
2007-03
期刊：
影响因子：
--
通讯作者：
T. Jiao;Guocheng Zhang;Minghua Liu
中科院分区：
文献类型：
--
作者：
T. Jiao;Guocheng Zhang;Minghua Liu
设计了一系列由不同长度的聚乙烯胺连接两个席夫碱基团的双子两亲分子，并研究了它们的界面组装。在接近中性的亚相上获得了凝聚的单分子膜，其中发现亲水性间隔子浸入亚相中。在强碱性和酸性亚相中，双子两亲分子的头基和间隔基分别发生解离和质子化，导致分子面积增大。从近中性亚相的单层膜得到平坦和均匀的域;从强酸性亚相转移的膜观察到花状或树枝状域。另一方面，当将阴离子四（4-磺酸基苯基）卟啉（TPPS）加入到酸性亚相中时，双子两亲分子与TPPS之间发生了原位络合物的形成。将复合膜转移到固体基底上，发现TPPS在复合膜中主要以J-聚集体的形式存在。由于双子两亲分子在酸性亚相中的多位点正电荷，使得双子两亲分子与TPPS复合膜呈现短纤维或纳米棒结构，并形成二维团聚手性畴。
A new series of gemini amphiphiles containing two Schiff base moieties linked by the poly(ethyleneamine) with different lengths were designed, and their interfacial assemblies were investigated. Condensed monolayers were obtained on nearly neutral subphase where the hydrophilic spacers were found to immerse into the subphase. On strong alkaline and acidic subphase, the headgroup and the spacer of the gemini amphiphiles underwent dissociation and protonation, respectively, resulting in the enlargement of the molecular areas. Flat and uniform domains were obtained for the monolayers from nearly neutral subphase; flower-like or dendritic domains were observed for the films transferred from strong acidic subphase. On the other hand, when an anionic tetrakis(4-sulfonatonphenyl)porphine (TPPS) was added into an acidic subphase, an in situ complex formation between the gemini amphiphiles and TPPS occurred. The complex monolayers were transferred onto solid substrate and TPPS existed predominantly as J-aggregate in the complex films. Due to the multisited positive charges in the spacer on acidic subphase, the complex films of gemini amphiphiles with TPPS appeared as short fiber or nanorod structures and formed two-dimensional (2D) conglomerate chiral domains.