Design and Interfacial Assembly of a New Series of Gemini Amphiphiles with Hydrophilic Poly(ethyleneamine) Spacers

详细信息    查看全文

• 作者：Tifeng Jiao ; Guocheng Zhang ; Minghua Liu
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：March 29, 2007
• 年：2007
• 卷：111
• 期：12
• 页码：3090 - 3097
• 全文大小：606K
• 年卷期：v.111,no.12(March 29, 2007)
• ISSN：1520-5207

文摘

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 monolayerswere obtained on nearly neutral subphase where the hydrophilic spacers were found to immerse into thesubphase. On strong alkaline and acidic subphase, the headgroup and the spacer of the gemini amphiphilesunderwent 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 ordendritic 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 situcomplex formation between the gemini amphiphiles and TPPS occurred. The complex monolayers weretransferred onto solid substrate and TPPS existed predominantly as J-aggregate in the complex films. Due tothe multisited positive charges in the spacer on acidic subphase, the complex films of gemini amphiphileswith TPPS appeared as short fiber or nanorod structures and formed two-dimensional (2D) conglomeratechiral domains.