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首页> 外文期刊>Chemistry: A European journal >Long synthetic nanotubes from calix[4]arenes
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Long synthetic nanotubes from calix[4]arenes

机译：杯[4]芳烃的长合成纳米管

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摘要

We report the synthesis and encapsulation properties of long (up to 5 nm) molecular nanotubes t-4, which are based on calix[4]arenes and can be filled with multiple nitrosonium (NO+) ions upon reaction with NO2/N2O4 gases. These are among the largest nanoscale molecular containers prepared to date and can entrap up to five guests. The structure and properties of tubular complexes 1.(NO+)(2)-4-(NO+)(5) were studied by UV/Vis, FTIR, and H-1 NMR spectroscopy in solution, and also by molecular modeling. Entrapment of NO+ in 1.(NO+)(2)-4-(NO+)(5) is reversible, and addition of [18]crown-6 quickly recovers starting tubes 1-4. The FTIR and titration data revealed enhanced binding of NO+ in longer tubes, which may be due to cooperativity. The described nanotubes may serve as materials for storing and converting NOx and also offer a promise to further develop supramolecular chemistry of molecular containers. These findings also open wider perspectives towards applications of synthetic nanotubes as alternatives to carbon nanotubes.
机译：我们报告了长（最多5 nm）分子纳米管t-4的合成和封装特性，该纳米管基于杯[4]芳烃，在与NO2 / N2O4气体反应后可以充满多个硝基（NO +）离子。这些是迄今为止制备的最大的纳米级分子容器，最多可容纳五名客人。管状配合物1.（NO +）（2）-4-（NO +）（5）的结构和性质通过溶液中的UV / Vis，FTIR和H-1 NMR光谱学以及分子建模进行了研究。将NO +截留在1.（NO +）（2）-4-（NO +）（5）中是可逆的，添加[18] crown-6可以迅速恢复起始管1-4。 FTIR和滴定数据表明，较长的试管中NO +的结合增强，这可能是由于协同作用。所描述的纳米管可以用作存储和转化NOx的材料，并且还有望进一步发展分子容器的超分子化学。这些发现也为合成碳纳米管作为碳纳米管的替代品的应用开辟了广阔的前景。

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