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在以基替代的基乙醇酸SAM中奇偶效应:基单元的非对称附着及其对SAM结构的影响
Waleed Azzam1, Abdu Subaihi2, Michael Rohwerder3
1Department of Chemistry, Tafila Technical University, P.O. Box 179, Tafila-66110, Jordan. wfazzam@ttu.edu.jo.
由于非对称的芳香附着,以替代的甲基酸盐 (Ant-n) 自组合单层 (SAM) 显示了减少的奇偶效应. 这导致了不同的结构和包装密度,与典型的AT SAM不同.
科学领域:
- 表面科学是一门学科.
- 材料化学 材料化学
- 纳米技术纳米技术
背景情况:
- 基替代基乙酸盐 (AT) 自组合单层 (SAM) 通常表现出奇偶效应,其中薄膜特性与基链长度平价相变.
- 在Ant-n SAMs中,素单元的非对称附着提供了一个独特的分子组织,可能会改变这些既定的奇偶效应.
研究的目的:
- 为了研究在Au上由烯基替代甲基乙烯酸盐 (Ant-n,n=1-6) 形成的SAM的结构性质.
- 分析非对称的 antracen 组对这些 SAM 的奇偶偶效应的影响.
主要方法:
- 在室温下在Au(111) 上形成Ant-n SAMs.
- 高分辨率扫描道显微镜 (STM) 用于结构分析.
- 分析STM数据以确定包装密度和结构变化.
主要成果:
- 大多数Ant-n SAM表现出两个有序相的共存,其中一些相与奇数或偶数链长相通,而另一些则在整个系列中变化.
- 平均包装密度根据链条长度平价变化7.5-10%,对于奇数n来说更高.
- 观察到的奇偶效应明显减少 (7.5-10%) 与典型的基替代SAMS (∼25%) 相比.
结论:
- 在Ant-n SAM中,素单元的非对称连接成功地弥补了典型的奇偶效应.
- 观察到各种各样的结构和减少包装密度的平价依赖变化,证实了芳香尾组几何学的影响.
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