title: Dynamics of paramagnetic metallofullerenes in carbon nanotube peapods.
abstract: We filled SWNTs with the paramagnetic fullerene Sc@C82 to form peapods. The interfullerene 1D packing distance measured using TEM is d = 1.1 +/- 0.02 nm. The Sc@C82 in SWNT peapods continuously rotated during the 2 s TEM exposure time, and we did not see the Sc atoms. However, Sc@C82 metallofullerenes in MWNT peapods have periods of fixed orientation, indicated by the brief observation of Sc atoms. La@C82 peapods were also prepared and their rotational behavior examined. The interfullerene 1D packing of both La@C82 and Sc@C82 peapods is identical and thus independent of the charge transfer state for these paramagnetic fullerenes. The La@C82 metallofullerenes in the peapods have fixed orientations for extended periods of time, up to 50 s in some cases. The La@C82 spontaneously rotates rapidly between fixed orientations.
authors.affiliation: Department of Materials, Quantum Information Processing Interdisciplinary Research Center, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom. Jamie.warner@materials.ox.ac.uk
authors.forename: Jamie H
authors.initials: JH
authors.lastname: Warner
authors.forename: Andrew A R
authors.initials: AA
authors.lastname: Watt
authors.forename: Ling
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authors.lastname: Ge
authors.forename: Kyriakos
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authors.lastname: Porfyrakis
authors.forename: Takao
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authors.lastname: Akachi
authors.forename: Haruya
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authors.lastname: Okimoto
authors.forename: Yasuhiro
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authors.lastname: Ito
authors.forename: Arzhang
authors.initials: A
authors.lastname: Ardavan
authors.forename: Barbara
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authors.lastname: Montanari
authors.forename: John H
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authors.lastname: Jefferson
authors.forename: Nicholas M
authors.initials: NM
authors.lastname: Harrison
authors.forename: Hisanori
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authors.lastname: Shinohara
authors.forename: G Andrew D
authors.initials: GA
authors.lastname: Briggs