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1 H NMR spectrum and spin‐lattice relaxation in C 60 · C 8 H 8
Author(s) -
Bokor Mónika,
Matus Péter,
Bánki Péter,
Kriza György,
Tompa Kálmán,
Kováts Éva,
Pekker Sándor,
Bényei Gyula,
Jalsovszky István
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200879638
Subject(s) - cubane , molecule , chemistry , relaxation (psychology) , atmospheric temperature range , spin–lattice relaxation , crystal structure , crystallography , fullerene , spectroscopy , condensed matter physics , physics , thermodynamics , psychology , social psychology , paramagnetism , organic chemistry , quantum mechanics
Abstract We have investigated the rotor‐stator molecular crystal fullerene‐cubane (C 60 · C 8 H 8 ) by 1 H NMR spectroscopy in the temperature range of 130 to 380 K. The 1 H line is broad and exhibits fine structure characteristic of a multispin spectrum, indicating the absence of angular reorientations 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. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)