Coaxially Stacked Coronene Columns inside Single‐Walled Carbon Nanotubes

Okazaki, Toshiya; Iizumi, Yoko; Okubo, Sho; Kataura, Hiromichi; Liu, Zheng; Suenaga, Kazu; Tahara, Yoshio; Yudasaka, Masako; Okada, Susumu; Iijima, Sumio

doi:10.1002/ange.201007832

Cited by 39 publications

(40 citation statements)

References 34 publications

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“…Microscopic observations have previously demonstrated the presence of supramolecular composites of organic molecules in single-wall carbon nanotubes (SWNT) 38 – 40 . Although the CH–π hydrogen bonds have not been considered for these composites, the present study with finite SWNT molecules suggests that the encapsulation could be driven by multiple, weak CH–π contacts in an enthalpically favourable manner.…”

Section: Discussionmentioning

confidence: 99%

Concyclic CH-π arrays for single-axis rotations of a bowl in a tube

et al. 2018

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The hydrogen bond is undoubtedly one of the most important non-covalent interactions. Among the several types of the hydrogen bonds, the CH–π interaction is a relatively new notion that is being recognised in chemistry and biology. Although the CH–π hydrogen bond and conventional hydrogen bonds share common features such as directionality, this weak interaction has played a secondary role in molecular recognition. In this study, we have devised a host–guest complex that is assembled solely by the CH–π hydrogen bonds. Multivalent interactions of a bowl-shaped hydrocarbon with its peripheral hydrogen atoms are made possible via CH–π hydrogen bonds by adopting a tubular hydrocarbon as a host for their enthalpy-driven complexation. Concyclic arrays of weak hydrogen bonds further allow dynamic rotational motions of the guest in the host. Solid-state analysis with crystallographic and spectroscopic methods reveal a single-axis rotation of the bowl in the tube.

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Section: Discussionmentioning

confidence: 99%

Concyclic CH-π arrays for single-axis rotations of a bowl in a tube

et al. 2018

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“…Single-wall carbon nanotubes (SWCNTs)12345, nano-scale cylinders consisting of single graphene sheet, are one of the most promising candidates for the fabrication of novel one-dimensional (1D) nanomaterials. To date, specific one-dimensional nanostructures, such as 1D crystalline array of molecules6789101112, metal complex nanowires13141516 and metal atomic wires171819, have been created inside SWCNTs, in which the properties of these are substantially different from their bulk counterparts: spontaneous chiral symmetry breaking20 and enlargement of magnetic moment19. However, the small band gap of SWCNTs typically ranging from 0 to about 1 eV23 has so far precluded one from investigating the intrinsic optical and electronic properties of 1D nanostructures formed in SWCNTs.…”

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confidence: 99%

Thin single-wall BN-nanotubes formed inside carbon nanotubes

Nakanishi

Kitaura

Warner

et al. 2013

Sci Rep

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We report a high yield synthesis of single-wall boron nitride nanotubes (SWBNNTs) inside single-wall carbon nanotubes (SWCNTs), a nano-templated reaction, using ammonia borane complexes (ABC) as a precursor. Transmission electron microscope (TEM), high angle annular dark field (HAADF)-scanning TEM (STEM), electron energy loss spectra (EELS) and high resolution EELS mapping using aberration-corrected TEM system clearly show the formation of thin SWBNNTs inside SWCNTs. We have found that the yield of the SWBNNT formation is high and that the most of ABC molecules decompose and fuse to form the thin BNNTs at a temperature of 1,673 K having a narrow diameter distribution of 0.7 ± 0.1 nm. Optical absorption measurements suggest that the band gap of the thin SWBNNTs is about 6.0 eV, which provide the ideal insulator nanotubes with very small diameters.

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“…We can see very clearly the image of an aromatic ring as small as a pyrene ring. A recent report showed the static side view of the coronene ring, illustrating the utility of SMRT‐TEM for structure determination of aromatic compounds 18…”

Section: Conformational Change Of Molecules Of Some Complexitymentioning

confidence: 97%

Movies of Molecular Motions and Reactions: The Single‐Molecule, Real‐Time Transmission Electron Microscope Imaging Technique

Nakamura

2012

Angew Chem Int Ed

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"The truth is, the Science of Nature has been already too long made only a work of the Brain and the Fancy: It is now high time that it should return to the plainness and soundness of Observations on material and obvious things," proudly declared Robert Hooke in his highly successful picture book of microscopic and telescopic images, "Micrographia" in 1665. Hooke's statement has remained true in chemistry, where a considerable work of the brain and the fancy is still necessary. Single-molecule, real-time transmission electron microscope (SMRT-TEM) imaging at an atomic resolution now allows us to learn about molecules simply by watching movies of them. Like any dream come true, the new analytical technique challenged the old common sense of the communities, and offers new research opportunities that are unavailable by conventional methods. With its capacity to visualize the motions and the reactions of individual molecules and molecular clusters, the SMRT-TEM technique will become an indispensable tool in molecular science and the engineering of natural and synthetic substances, as well as in science education.

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Coaxially Stacked Coronene Columns inside Single‐Walled Carbon Nanotubes

Cited by 39 publications

References 34 publications

Concyclic CH-π arrays for single-axis rotations of a bowl in a tube

Concyclic CH-π arrays for single-axis rotations of a bowl in a tube

Thin single-wall BN-nanotubes formed inside carbon nanotubes

Movies of Molecular Motions and Reactions: The Single‐Molecule, Real‐Time Transmission Electron Microscope Imaging Technique

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