2D supramolecular structures of a shape-persistent macrocycle and co-deposition with fullerene on HOPG |
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Authors: | Pan Ge-Bo Cheng Xiao-Hong Höger Sigurd Freyland Werner |
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Institution: | Institute of Physical Chemistry, Karlsruhe University, Germany. |
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Abstract: | 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. |
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