@article{oai:nagoya.repo.nii.ac.jp:00026373,
 author = {Takeda, Motoki and Hiroto, Satoru and Yokoi, Hiroki and Lee, Sangsu and Kim, Dongho and Shinokubo, Hiroshi},
 issue = {20},
 journal = {Journal of the American Chemical Society},
 month = {May},
 note = {We designed and synthesized molecular tweezers consisting of nitrogen-embedded buckybowl subunits. The judicious choice of the covalent linkers modulated their binding strength with C60 or C70 in solution. Titration studies by optical and 1H NMR analyses revealed a 1:1 composition of the resulting complexes. X-ray diffraction analysis elucidated their solid-state structures, in which two azabuckybowl units surround one fullerene molecule. The large association constants stabilize the complexes toward redox reactions and the purification process on silica-gel column chromatography. The linker enabled tuning of the cavity size for binding of fullerenes, achieving complementary fullerene hosts for C60 and C70: the carbazole-bridged dimer preferentially associates with C70 over C60, while the phenanthrene-bridged dimer interacts with C60 more strongly than C70. Electrochemical analysis in combination with density functional theory calculations indicated the existence of intermolecular charge-transfer interactions between the buckybowl units and the fullerenes. Nonlinear optical measurements showed that the two-photon absorption cross sections of the molecular tweezers are enhanced upon association with fullerenes., ファイル公開：2019-05-23},
 pages = {6336--6342},
 title = {Azabuckybowl-Based Molecular Tweezers as C60 and C70 Receptors},
 volume = {140},
 year = {2018}
}