Rotational dynamics of confined C60 from near-infrared Raman studies under high pressure

Journal Article · Tue Dec 29 00:00:00 EST 2009 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.0911963106· OSTI ID:1065552

Zou, Y. ^[1]; Liu, B. ^[1]; Wang, L. ^[1]; Liu, D. ^[1]; Yu, S. ^[1]; Wang, P. ^[1]; Wang, T. ^[1]; Yao, M. ^[1]; Li, Q. ^[1]; Zou, B. ^[1]; Cui, T. ^[1]; Zou, G. ^[1]; Wagberg, T. ^[2]; Sundqvist, B. ^[2]; Mao, H.-K. ^[3]

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1. Jilin Univ., Changchun (China). State Key Laboratory of Superhard Materials
2. Umea Univ. (Sweden)
3. Jilin Univ., Changchun (China). State Key Laboratory of Superhard Materials; Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.

Peapods present a model system for studying the properties of dimensionally constrained crystal structures, whose dynamical properties are very important. We have recently studied the rotational dynamics of C₆₀ molecules confined inside single walled carbon nanotube (SWNT) by analyzing the intermediate frequency mode lattice vibrations using near-infrared Raman spectroscopy. The rotation of C₆₀ was tuned to a known state by applying high pressure, at which condition C₆₀ first forms dimers at low pressure and then forms a single-chain, nonrotating, polymer structure at high pressure. In the latter state the molecules form chains with a 2-fold symmetry. We propose that the C₆₀ molecules in SWNT exhibit an unusual type of ratcheted rotation due to the interaction between C₆₀ and SWNT in the “hexagon orientation,” and the characteristic vibrations of ratcheted rotation becomes more obvious with decreasing temperature.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
• Sponsoring Organization: USDOE
• DOE Contract Number: SC0001057
• OSTI ID: 1065552
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America, Vol. 106, Issue 52; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 0027-8424
• Publisher: National Academy of Sciences, Washington, DC (United States)
• Country of Publication: United States
• Language: English

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