H-1 NMR spectrum and spin-lattice relaxation in C-60 center dot C8H8

Bokor, Mónika Zsuzsanna and Matus, Péter and Banki, P. and Kriza, György and Tompa, Kálmán and Kováts, Éva and Pekker, Sándor (2008) H-1 NMR spectrum and spin-lattice relaxation in C-60 center dot C8H8. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 245 (10). pp. 2010-2012. ISSN 0370-1972

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Abstract

We have investiagted the rotor-stator molecular crystal fullerene-cubane (C-60 center dot C8H8) by H-1 NMR spectroscopy in the temperature range of 130 to 380 K. The H-1 line is broad and exhibits fine structure characteristic of a multispin spectrum, indicating the absence of angular reorientationos of the cubane molecule. The temperature and field dependence of the spin-lattice relaxation rate of cubane protons is well explained in terms of field fluctuations arising from reorientations of the C-60 molecules. Despite the closely packed structure, the activation energy of these reorientations, 650 K is close to that observed in the high-temperature phase of pure C-60 indicating that the static cubane molecules act as efficient bearing for the rotating fullerene molecules. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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