Pan Ge-Bo, Cheng Xiao-Hong, Höger Sigurd, Freyland Werner
Institute of Physical Chemistry, Karlsruhe University, Germany.
J Am Chem Soc. 2006 Apr 5;128(13):4218-9. doi: 10.1021/ja060469f.
Two 2D supramolecular structures of macrocycle 1 and 1/C60 have been obtained on HOPG by self-assembly under ambient conditions and investigated by high-resolution STM. The monolayers of 1 are characterized by structures with perfect ordering over relatively large areas. In the case of 1/C60, the size of the macrocycle 1 and the presence of two individual bithiophene units per ring lead in the final superstructure to a 1:2 stoichiometry. The fullerenes are not trapped at the graphite surface inside the macrocyclic holes but are located around the periphery of the bithiophene units. This clearly shows that the donor-acceptor interaction between C60 and the electron-rich units of the ring is the dominant factor for the structure formation.
在环境条件下通过自组装在高定向热解石墨（HOPG）上获得了大环1和1/C60的两种二维超分子结构，并通过高分辨率扫描隧道显微镜（STM）进行了研究。1的单层结构的特征是在相对较大的区域内具有完美的有序排列。在1/C60的情况下，大环1的尺寸以及每个环中两个单独的联噻吩单元的存在导致最终的超结构具有1:2的化学计量比。富勒烯没有被困在大环孔内的石墨表面，而是位于联噻吩单元的周边。这清楚地表明C60与环的富电子单元之间的供体-受体相互作用是结构形成的主导因素。
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