13C NMR investigation of fullerene-cubane C60·C8H8 cocrystals

Péter Matus, Mónika Bokor, György Kriza, Éva Kováts, Sándor Pekker, Attila Domján, Gábor Durkó, István Jalsovszky

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Abstract

The rotor-stator molecular cocrystal C60·C8H8= (fullerene-cubane) has been investigated by 13C nuclear magnetic resonance (NMR). The room-temperature spectrum obtained using 1H-13C cross-polarization technique shows two lines with chemical shifts identical with the shifts of the original molecular constituents demonstrating the lack of a strong electronic interaction between C60 and C8H8. The temperature dependence of the spin-lattice relaxation time of the fullerene component confirms the existence of a first-order orientational ordering transition around 145 K. The activation energies of large-angle C60 reorientations above and below the ordering transitions are 260K and 570 K, respectively. The transition temperature and the activation energies are significantly lower than in other C60 compounds. The 13C spectrum remains narrow down to 115K indicating that similarly to pristine C60, the molecular reorientational motion is still fast in the ordered phase on the NMR time scale.

Original languageEnglish
Pages (from-to)2764-2766
Number of pages3
JournalPhysica Status Solidi (B) Basic Research
Volume246
Issue number11-12
DOIs
Publication statusPublished - Dec 1 2009

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Matus, P., Bokor, M., Kriza, G., Kováts, É., Pekker, S., Domján, A., Durkó, G., & Jalsovszky, I. (2009). 13C NMR investigation of fullerene-cubane C60·C8H8 cocrystals. Physica Status Solidi (B) Basic Research, 246(11-12), 2764-2766. https://doi.org/10.1002/pssb.200982347