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Direct Imaging of the Structure, Relaxation, and Sterically Constrained Motion of Encapsulated Tungsten Polyoxometalate Lindqvist Ions within Carbon Nanotubes

Sloan, Jeremy and Matthewman, Gemma and Dyer-Smith, Clare and Sung, A-Young and Liu, Zheng and Suenaga, Kazu and Kirkland, Angus I. and Flahaut, Emmanuel Direct Imaging of the Structure, Relaxation, and Sterically Constrained Motion of Encapsulated Tungsten Polyoxometalate Lindqvist Ions within Carbon Nanotubes. (2008) ACS Nano, vol. 2 (n° 5). pp. 966-976. ISSN 1936-0851

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Official URL: http://dx.doi.org/10.1021/nn7002508

Abstract

The imaging properties and observation of the sterically regulated translational motion of discrete tungsten polyoxometalate Linqvist ions (i.e., [W6O19]2) within carbon nanotubes of specific internal diameter are reported. The translational motion of the nonspheroidal anion within the nanotube capillary is found to be impeded by its near-perfect accommodation to the internal van der Waals surface of the nanotube wall. Rotational motion of the anion about one remaining degree of freedom permits translational motion of the anion along the nanotube followed by locking in at sterically favorable positions in a mechanism similar to a molecular ratchet. This steric locking permits the successful direct imaging of the constituent octahedral cation template of individual [W6O19]2 anions by high resolution transmission electron microscopy thereby permitting meterological measurements to be performed directly on the anion. Direct imaging of pairs of equatorial W2 atoms within the anion reveal steric relaxation of the anion contained within the nanotube capillary relative to the bulk anion structure.

Item Type:Article
Additional Information:Thanks to American Chemical Society editor. The definitive version is available at http://pubs.acs.org The original PDF of the article can be found at ACS Nano website : http://pubs.acs.org/journal/ancac3
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > National Institute for Advanced Industrial Science and Technology - AIST (JAPAN)
Other partners > University of London (UNITED KINGDOM)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > University of Oxford (UNITED KINGDOM)
Other partners > Daebul University (SOUTH KOREA)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Celine Cabaup

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