Bottom-up realization of a porous metal-organic nanotubular assembly
Bottom-up realization of a porous metal-organic nanotubular assembly
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DOI：
10.1038/nmat2963
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发表时间：
2011-04-01
期刊：
影响因子：
41.2
通讯作者：
Kitagawa, Hiroshi
中科院分区：
文献类型：
--
作者：
Otsubo, Kazuya;Wakabayashi, Yusuke;Kitagawa, Hiroshi
纳米管通常是在高温下由其组成元素制备而成的，因此很难控制它们的尺寸、形状和电子态。一种用于合成明确纳米结构的有效方法涉及使用诸如金属离子和有机分子之类的构建单元。在此，我们展示了成功制备出一种由方形金属 - 有机框架简单聚合得到的无限方形棱柱形金属 - 有机纳米管的组装体。组成的纳米管具有一个窗口尺寸为5.9×5.9平方埃的一维（1D）通道，并且能够吸附水（H₂O）和醇蒸汽，而N₂和CO₂则不会附着。它由四条一维共价链组成，在结晶时构成一种独特的“电荷密度波（CDW）四重态”电子结构。此外，交换结构组分和客体分子使我们能够控制其半导体带隙。这些发现证明了自下而上构建新型多孔纳米管的可能性，其中可以利用其在孔隙空间和框架两方面的自由度。
Nanotubes are generally prepared from their constituent elements at high temperatures, and thus it is difficult to control their size, shape and electronic states. One useful approach for synthesizing well-defined nanostructures involves the use of building blocks such as metal ions and organic molecules. Here, we show the successful creation of an assembly of infinite square prism-shaped metal-organic nanotubes obtained from the simple polymerization of a square-shaped metal-organic frame. The constituent nanotube has a one-dimensional (1D) channel with a window size of 5.9 x 5.9 angstrom(2), and can adsorb water (H2O) and alcohol vapours, whereas N-2 and CO2 do not adhere. It consists of four 1D covalent chains that constitute a unique electronic structure of 'charge-density wave (CDW) quartets' on crystallization. Moreover, exchanging structural components and guest molecules enables us to control its semiconductive bandgap. These findings demonstrate the possibility of bottom-up construction of new porous nanotubes, where their degrees of freedom in both pore space and framework can be used.