Hierarchical Hybrid Nanostructures Constructed by Fullerene and Molecular Tweezer.
basic_science · Level V
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- Record sourced from PubMed, PMID 31042357.
- Also identified by DOI 10.1021/acsnano.9b02893.
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Abstract
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 K<sub>1</sub>) and 2:1 (log K<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.