Purdue University Fort Wayne, Department of Chemistry, Fort Wayne Indiana 46805, United States.
State Key Lab for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
J Am Chem Soc. 2020 Sep 9;142(36):15614-15623. doi: 10.1021/jacs.0c08529. Epub 2020 Aug 31.
We report a chemical separation method to isolate : a new and soluble allotrope of carbon whose structure merges nanotube, graphene, and fullerene subunits. Fullertubes possess single-walled carbon nanotube belts resembling a rolled graphene midsection, but with half-fullerene end-caps. Unlike nanotubes, fullertubes are reproducible in structure, possess a defined molecular weight, and are soluble in pristine form. The high reactivity of amines with spheroidal fullerene cages enables their removal and allows a facile isolation of C-(3), C-(1), and C-(1) fullertubes. A nonchromatographic step (Stage 1) uses a selective reaction of carbon cages with aminopropanol to permit a highly enriched sample of fullertubes. Spheroidal fullerenes are reacted and removed by attaching water-soluble groups onto their cage surfaces. With this enriched (100-1000 times) fullertube mixture, Stage 2 becomes a simple HPLC collection with a single column. This two-stage separation approach permits fullertubes in scalable quantities. Characterization of purified C-(1) fullertubes is done with samples isolated in and form. Surprisingly, C and C-(1) are both in solution. For X-ray crystallographic analysis, we used decapyrrylcorannulene (DPC). Isomerically purified C and C fullertubes were mixed with DPC to obtain black cocrystals of 2DPC{C-(1)}·4(toluene) and 2DPC{C-(1)}·4(toluene), respectively. A serendipitous outcome of this chemical separation approach is the enrichment and purification of several larger carbon species, e.g., C, C, and C. Isolation of these higher cage species represents a significant advance in the unknown arena of C-C structures. Our findings represent seminal evidence for the existence of mathematically predicted families of fullertubes: one family with an axial with the other series based on an axial ring. Fullertubes have been predicted theoretically, and herein is their experimental evidence, isolation, and initial characterization.
我们报告了一种化学分离方法，用于分离：一种新的可溶性碳同素异形体，其结构融合了纳米管、石墨烯和富勒烯亚基。富勒管具有类似于展开的石墨烯中段的单壁碳纳米管带，但具有半富勒烯端帽。与纳米管不同，富勒管在结构上是可重复的，具有确定的分子量，并且在原始形式下是可溶的。胺与球形富勒烯笼的高反应性使其得以去除，并允许轻松分离 C-(3)、C-(1) 和 C-(1) 富勒管。非色谱步骤（第 1 阶段）使用碳笼与氨基丙醇的选择性反应，允许对富勒管进行高度富集的样品。球形富勒烯通过将水溶性基团附着在其笼表面上来进行反应和去除。用这种富集（100-1000 倍）的富勒管混合物，第 2 阶段成为带有单个柱子的简单 HPLC 收集。这种两阶段分离方法允许大规模分离富勒管。用在 和 形式中分离的样品对纯化的 C-(1) 富勒管进行了表征。令人惊讶的是，C 和 C-(1) 在溶液中都是 。对于 X 射线晶体学分析，我们使用去吡咯corannulene（DPC）。通过异构体纯化的 C 和 C 富勒管与 DPC 混合，分别得到二维 DPC{C-(1)}·4(甲苯)和 2DPC{C-(1)}·4(甲苯)的黑色共晶。这种化学分离方法的一个意外结果是富集和纯化了几种更大的碳物种，例如 C、C 和 C。这些更高笼物种的分离代表了在未知的 C-C 结构领域的重大进展。我们的发现为富勒管的数学预测家族的存在提供了重要的证据：一个家族具有轴向 ，另一个系列基于轴向 环。富勒管已在理论上进行了预测，本文提供了它们的实验证据、分离和初步表征。
