Jiao Tifeng, Liu Minghua
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, PR China.
Langmuir. 2006 May 23;22(11):5005-12. doi: 10.1021/la060343w.
Great interest has been devoted to the gemini amphiphiles because of their unique properties. In this article, we report some interesting properties of the interfacial films formed by a series of newly designed gemini amphiphiles containing the Schiff base moiety. This novel series of gemini amphiphiles with their Schiff base headgroups linked by a hydrophobic alkyl spacer (BisSBC18Cn, n = 2, 4, 6, 8, 10) could be spread to form stable monolayers and coordinated with Cu(Ac)(2) in situ in the monolayer. The alkyl spacer in the amphiphiles has a great effect on the regulation of the properties of the Langmuir monolayers. A maximum limiting molecular area was observed for the monolayers of the gemini amphiphile with the spacer length of hexa- or octamethylene groups. Both the monolayers on water and on the aqueous Cu(Ac)(2) subphase were transferred onto solid substrates, and different morphologies were observed for films with different spacers. Nanonail and tapelike morphologies were observed for amphiphile films with shorter spacers (n = 2 and 4) on the water surface. Wormlike morphologies were observed for gemini films with longer spacers of C(8) and C(10) when coordinated with Cu(Ac)(2). An interdigitated layer structure was supposed to form in the multilayer films transferred from water or the aqueous Cu(Ac)(2) subphase.
由于其独特的性质，双子两亲分子引起了人们极大的兴趣。在本文中，我们报道了一系列新设计的含席夫碱部分的双子两亲分子形成的界面膜的一些有趣性质。这一系列新型的双子两亲分子，其席夫碱头基通过疏水烷基间隔基相连（BisSBC18Cn，n = 2、4、6、8、10），能够铺展形成稳定的单分子层，并在单分子层中原位与Cu(Ac)₂配位。两亲分子中的烷基间隔基对朗缪尔单分子层性质的调控有很大影响。对于间隔基长度为六亚甲基或八亚甲基的双子两亲分子的单分子层，观察到了最大极限分子面积。水表面和Cu(Ac)₂水相亚相上的单分子层都被转移到了固体基质上，对于不同间隔基的膜观察到了不同的形态。在水表面，间隔基较短（n = 2和4）的两亲分子膜呈现纳米钉状和带状形态。当与Cu(Ac)₂配位时，间隔基为C₈和C₁₀的双子两亲分子膜呈现蠕虫状形态。从水或Cu(Ac)₂水相亚相转移的多层膜中推测形成了交错层结构。
