Controlling on-surface polymerization by hierarchical and substrate-directed growth
Controlling on-surface polymerization by hierarchical and substrate-directed growth
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DOI：
10.1038/nchem.1242
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发表时间：
2012-03-01
期刊：
影响因子：
21.8
通讯作者：
Grill, L.
中科院分区：
文献类型：
--
作者：
Lafferentz, L.;Eberhardt, V.;Grill, L.
纳米技术领域的一个关键挑战，特别是在分子机器、新材料或分子电子学的设计中，是以明确的排列方式自下而上地构建共价结合的分子结构。到目前为止，由于一步连接过程的限制，只获得了相当简单的结构。事实上，为了形成复杂的结构，分子需要一步一步地连接起来。在这里，我们提出了一种策略，通过选择性和顺序激活特定位点，以分级方式连接分子的共价，从而产生具有编程反应性的物种。这种方法改善了网络质量，并能够以高选择性制造不同的体系结构。此外，在各向异性表面上实现了衬底定向生长和分子纳米结构的择优取向。在共价键形成过程中展示的对反应性和扩散的控制构成了创建复杂的多组分分子纳米结构的一条有希望的途径。
A key challenge in the field of nanotechnology, in particular in the design of molecular machines, novel materials or molecular electronics, is the bottom-up construction of covalently bound molecular architectures in a well-defined arrangement. To date, only rather simple structures have been obtained because of the limitation of one-step connection processes. Indeed, for the formation of sophisticated structures, step-by-step connection of molecules is required. Here, we present a strategy for the covalent connection of molecules in a hierarchical manner by the selective and sequential activation of specific sites, thereby generating species with a programmed reactivity. This approach leads to improved network quality and enables the fabrication of heterogeneous architectures with high selectivity. Furthermore, substrate-directed growth and a preferred orientation of the molecular nanostructures are achieved on an anisotropic surface. The demonstrated control over reactivity and diffusion during covalent bond formation constitutes a promising route towards the creation of sophisticated multi-component molecular nanostructures.