Sponge-like molecular cage for purification of fullerenes
Sponge-like molecular cage for purification of fullerenes
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DOI：
10.1038/ncomms6557
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发表时间：
2014-11-01
影响因子：
16.6
通讯作者：
Ribas, Xavi
中科院分区：
文献类型：
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作者：
Garcia-Simon, Cristina;Garcia-Borras, Marc;Ribas, Xavi
由于从富勒烯烟尘中可以获得大量的富勒烯，人们一直致力于设计有效的策略来获得高纯度的富勒烯，这些富勒烯随后可以应用于多种研究领域。在这里，我们提出了一种通过金属定向自组装合成的超分子纳米笼子，它包裹了不同大小的富勒烯。为C-60、C-70、C-76、C-78和C-84的1：1包覆提供了直接的实验证据，并用X射线同步辐射获得了C-60和C-70的主客体加合物的固态结构。此外，我们设计了一种基于洗涤的策略，从充满富勒烯混合物的笼子固体样品中唯一地提取纯C-60。这些结果展示了一种从富勒烯混合物中选择性提取C-60的有吸引力的方法，为设计用于选择性提取较高富勒烯的调谐笼子提供了一个平台。富勒烯的固相包裹和释放代表了分子纳米笼结构的主-客体化学的一个转折。
Since fullerenes are available in macroscopic quantities from fullerene soot, large efforts have been geared toward designing efficient strategies to obtain highly pure fullerenes, which can be subsequently applied in multiple research fields. Here we present a supramolecular nanocage synthesized by metal-directed self-assembly, which encapsulates fullerenes of different sizes. Direct experimental evidence is provided for the 1: 1 encapsulation of C-60, C-70, C-76, C-78 and C-84, and solid state structures for the host-guest adducts with C-60 and C-70 have been obtained using X-ray synchrotron radiation. Furthermore, we design a washing-based strategy to exclusively extract pure C-60 from a solid sample of cage charged with a mixture of fullerenes. These results showcase an attractive methodology to selectively extract C-60 from fullerene mixtures, providing a platform to design tuned cages for selective extraction of higher fullerenes. The solid-phase fullerene encapsulation and liberation represent a twist in host-guest chemistry for molecular nanocage structures.