Hierarchical Hybrid Nanostructures Constructed by Fullerene and Molecular Tweezer

다국어 초록 (Multilingual Abstract)

<P>For the construction of well-defined hierarchical superstructures of pristine [60]fullerene (C<SUB>60</SUB>) arrays, pyrene-based molecular tweezers (PT) were used as host molecules for catching and arranging C<SUB>60</SUB> guest molecules. The formation of host-guest complexes was systematically studied in solution as well as in the solid state. Two-dimensional proton nuclear magnetic resonance spectroscopic studies revealed that PT-host and C<SUB>60</SUB>-guest complexes were closely related to the molecular self-assembly of PT. Ultraviolet and fluorescence spectroscopic titrations indicated the formation of stable 1:1 and 2:1 (PT/C<SUB>60</SUB>) complexes. From the nonlinear curve-fitting analysis, equilibrium constants for the 1:1 (log <I>K</I><SUB>1</SUB>) and 2:1 (log <I>K</I><SUB>2</SUB>) complexes were estimated to be 4.96 and 5.01, respectively. X-ray diffraction results combined with transmission electron microscopy observations clearly exhibited the construction of well-defined layered superstructures of the PT-host and C<SUB>60</SUB>-guest complexes. From electron mobility measurements, it was demonstrated that the well-defined hierarchical hybrid nanostructure incorporating a C<SUB>60</SUB> array exhibited a high electron mobility of 1.7 × 10<SUP>-2</SUP> cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP>. This study can provide a guideline for the hierarchical hybrid nanostructures of host-guest complex and its applications.</P>
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